diff --git a/include/criterion/internal/asprintf-compat.h b/include/criterion/internal/asprintf-compat.h
index 00bf2949..06033125 100644
--- a/include/criterion/internal/asprintf-compat.h
+++ b/include/criterion/internal/asprintf-compat.h
@@ -21,6 +21,7 @@
  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  * THE SOFTWARE.
  */
+// IWYU pragma: private, include "criterion/criterion.h"
 #ifndef CRITERION_ASPRINTF_COMPAT_H_
 #define CRITERION_ASPRINTF_COMPAT_H_
 
diff --git a/include/criterion/internal/assert.h b/include/criterion/internal/assert.h
index c2ec3dbd..be3ab12a 100644
--- a/include/criterion/internal/assert.h
+++ b/include/criterion/internal/assert.h
@@ -21,6 +21,7 @@
  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  * THE SOFTWARE.
  */
+// IWYU pragma: private, include "criterion/criterion.h"
 #ifndef CRITERION_INTERNAL_ASSERT_H_
 #define CRITERION_INTERNAL_ASSERT_H_
 
diff --git a/include/criterion/internal/assert/complex.h b/include/criterion/internal/assert/complex.h
index c55e112e..27cee787 100644
--- a/include/criterion/internal/assert/complex.h
+++ b/include/criterion/internal/assert/complex.h
@@ -21,6 +21,7 @@
  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  * THE SOFTWARE.
  */
+// IWYU pragma: private, include "criterion/criterion.h"
 #ifndef CRITERION_INTERNAL_COMPLEX_H_
 #define CRITERION_INTERNAL_COMPLEX_H_
 
diff --git a/include/criterion/internal/assert/exceptions.h b/include/criterion/internal/assert/exceptions.h
index 79e6cd3b..0170cbe2 100644
--- a/include/criterion/internal/assert/exceptions.h
+++ b/include/criterion/internal/assert/exceptions.h
@@ -21,6 +21,7 @@
  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  * THE SOFTWARE.
  */
+// IWYU pragma: private, include "criterion/criterion.h"
 #ifndef CRITERION_INTERNAL_ASSERT_EXCEPTIONS_H_
 #define CRITERION_INTERNAL_ASSERT_EXCEPTIONS_H_
 
diff --git a/include/criterion/internal/assert/ieee.h b/include/criterion/internal/assert/ieee.h
index ea95a807..73860244 100644
--- a/include/criterion/internal/assert/ieee.h
+++ b/include/criterion/internal/assert/ieee.h
@@ -21,6 +21,7 @@
  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  * THE SOFTWARE.
  */
+// IWYU pragma: private, include "criterion/criterion.h"
 #ifndef CRITERION_INTERNAL_ASSERT_IEEE_H_
 #define CRITERION_INTERNAL_ASSERT_IEEE_H_
 
diff --git a/include/criterion/internal/assert/memory.h b/include/criterion/internal/assert/memory.h
index b9af1c3b..c0e1403c 100644
--- a/include/criterion/internal/assert/memory.h
+++ b/include/criterion/internal/assert/memory.h
@@ -21,6 +21,7 @@
  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  * THE SOFTWARE.
  */
+// IWYU pragma: private, include "criterion/criterion.h"
 #ifndef CRITERION_INTERNAL_MEMORY_H_
 #define CRITERION_INTERNAL_MEMORY_H_
 
diff --git a/include/criterion/internal/assert/op.h b/include/criterion/internal/assert/op.h
index 98271bcb..df05d223 100644
--- a/include/criterion/internal/assert/op.h
+++ b/include/criterion/internal/assert/op.h
@@ -21,6 +21,7 @@
  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  * THE SOFTWARE.
  */
+// IWYU pragma: private, include "criterion/criterion.h"
 #ifndef CRITERION_INTERNAL_ASSERT_OP_H_
 #define CRITERION_INTERNAL_ASSERT_OP_H_
 
diff --git a/include/criterion/internal/assert/op.hxx b/include/criterion/internal/assert/op.hxx
index 1ffa075d..a1382b0a 100644
--- a/include/criterion/internal/assert/op.hxx
+++ b/include/criterion/internal/assert/op.hxx
@@ -21,6 +21,7 @@
  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  * THE SOFTWARE.
  */
+// IWYU pragma: private, include "criterion/criterion.h"
 #ifndef CRITERION_INTERNAL_ASSERT_OP_HXX_
 #define CRITERION_INTERNAL_ASSERT_OP_HXX_
 
diff --git a/include/criterion/internal/assert/stream.h b/include/criterion/internal/assert/stream.h
index 172f8571..ea05bebf 100644
--- a/include/criterion/internal/assert/stream.h
+++ b/include/criterion/internal/assert/stream.h
@@ -21,6 +21,7 @@
  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  * THE SOFTWARE.
  */
+// IWYU pragma: private, include "criterion/criterion.h"
 #ifndef CRITERION_INTERNAL_STREAM_H_
 #define CRITERION_INTERNAL_STREAM_H_
 
diff --git a/include/criterion/internal/assert/tag.h b/include/criterion/internal/assert/tag.h
index 27bf879d..83edef73 100644
--- a/include/criterion/internal/assert/tag.h
+++ b/include/criterion/internal/assert/tag.h
@@ -21,6 +21,7 @@
  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  * THE SOFTWARE.
  */
+// IWYU pragma: private, include "criterion/criterion.h"
 #ifndef CRITERION_INTERNAL_ASSERT_TAG_H_
 #define CRITERION_INTERNAL_ASSERT_TAG_H_
 
diff --git a/include/criterion/internal/assert/tostr.h b/include/criterion/internal/assert/tostr.h
index 498a0363..424679dc 100644
--- a/include/criterion/internal/assert/tostr.h
+++ b/include/criterion/internal/assert/tostr.h
@@ -21,6 +21,7 @@
  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  * THE SOFTWARE.
  */
+// IWYU pragma: private, include "criterion/criterion.h"
 #ifndef CRITERION_INTERNAL_ASSERT_TOSTR_H_
 #define CRITERION_INTERNAL_ASSERT_TOSTR_H_
 
diff --git a/include/criterion/internal/assert/types.h b/include/criterion/internal/assert/types.h
index 55ea54bc..4c5046e2 100644
--- a/include/criterion/internal/assert/types.h
+++ b/include/criterion/internal/assert/types.h
@@ -21,6 +21,7 @@
  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  * THE SOFTWARE.
  */
+// IWYU pragma: private, include "criterion/criterion.h"
 #ifndef CRITERION_INTERNAL_ASSERT_TYPES_H_
 #define CRITERION_INTERNAL_ASSERT_TYPES_H_
 
diff --git a/include/criterion/internal/capabilities.h b/include/criterion/internal/capabilities.h
index 21ab784e..1e7ef3ce 100644
--- a/include/criterion/internal/capabilities.h
+++ b/include/criterion/internal/capabilities.h
@@ -23,6 +23,7 @@
  */
 #ifndef CRITERION_INTERNAL_DETECT_H_
 #define CRITERION_INTERNAL_DETECT_H_
+// IWYU pragma: private, include "criterion/criterion.h"
 
 /* Standard version checks */
 #if !defined (CR_NO_COMPILER_CHECK)
diff --git a/include/criterion/internal/deprecation.h b/include/criterion/internal/deprecation.h
index 514ba378..cec04eae 100644
--- a/include/criterion/internal/deprecation.h
+++ b/include/criterion/internal/deprecation.h
@@ -21,6 +21,7 @@
  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  * THE SOFTWARE.
  */
+// IWYU pragma: private, include "criterion/criterion.h"
 #ifndef CRITERION_INTERNAL_DEPRECATION_H_
 #define CRITERION_INTERNAL_DEPRECATION_H_
 
diff --git a/include/criterion/internal/designated-initializer-compat.h b/include/criterion/internal/designated-initializer-compat.h
index c59328e6..1742f922 100644
--- a/include/criterion/internal/designated-initializer-compat.h
+++ b/include/criterion/internal/designated-initializer-compat.h
@@ -21,6 +21,7 @@
  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  * THE SOFTWARE.
  */
+// IWYU pragma: private, include "criterion/criterion.h"
 #ifndef CRITERION_DESIGNATED_INITIALIZER_COMPAT_HH_
 #define CRITERION_DESIGNATED_INITIALIZER_COMPAT_HH_
 
diff --git a/include/criterion/internal/hooks.h b/include/criterion/internal/hooks.h
index 78159b18..b0b41689 100644
--- a/include/criterion/internal/hooks.h
+++ b/include/criterion/internal/hooks.h
@@ -21,6 +21,7 @@
  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  * THE SOFTWARE.
  */
+// IWYU pragma: private, include "criterion/criterion.h"
 #ifndef CRITERION_INTERNAL_HOOKS_H_
 #define CRITERION_INTERNAL_HOOKS_H_
 
diff --git a/include/criterion/internal/new_asserts.h b/include/criterion/internal/new_asserts.h
index e9e30d2c..77ba46d7 100644
--- a/include/criterion/internal/new_asserts.h
+++ b/include/criterion/internal/new_asserts.h
@@ -21,6 +21,7 @@
  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  * THE SOFTWARE.
  */
+// IWYU pragma: private, include "criterion/criterion.h"
 #ifndef CRITERION_INTERNAL_NEW_ASSERTS_H_
 #define CRITERION_INTERNAL_NEW_ASSERTS_H_
 
diff --git a/include/criterion/internal/ordered-set.h b/include/criterion/internal/ordered-set.h
index 10fef8c6..12bcef93 100644
--- a/include/criterion/internal/ordered-set.h
+++ b/include/criterion/internal/ordered-set.h
@@ -21,6 +21,7 @@
  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  * THE SOFTWARE.
  */
+// IWYU pragma: private, include "criterion/criterion.h"
 #ifndef CRITERION_ORDERED_SET_H_
 #define CRITERION_ORDERED_SET_H_
 
diff --git a/include/criterion/internal/parameterized.h b/include/criterion/internal/parameterized.h
index da258368..e70a312e 100644
--- a/include/criterion/internal/parameterized.h
+++ b/include/criterion/internal/parameterized.h
@@ -21,6 +21,7 @@
  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  * THE SOFTWARE.
  */
+// IWYU pragma: private, include "criterion/criterion.h"
 #ifndef CRITERION_INTERNAL_PARAMETERIZED_H_
 #define CRITERION_INTERNAL_PARAMETERIZED_H_
 
diff --git a/include/criterion/internal/preprocess.h b/include/criterion/internal/preprocess.h
index ac344814..37d736aa 100644
--- a/include/criterion/internal/preprocess.h
+++ b/include/criterion/internal/preprocess.h
@@ -21,6 +21,7 @@
  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  * THE SOFTWARE.
  */
+// IWYU pragma: private, include "criterion/criterion.h"
 #ifndef CRITERION_PREPROCESS_H_
 #define CRITERION_PREPROCESS_H_
 
diff --git a/include/criterion/internal/redirect.h b/include/criterion/internal/redirect.h
index 3d8ce974..7f600969 100644
--- a/include/criterion/internal/redirect.h
+++ b/include/criterion/internal/redirect.h
@@ -21,6 +21,7 @@
  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  * THE SOFTWARE.
  */
+// IWYU pragma: private, include "criterion/criterion.h"
 #ifndef CRITERION_INTERNAL_REDIRECT_H_
 #define CRITERION_INTERNAL_REDIRECT_H_
 
diff --git a/include/criterion/internal/stdio_filebuf.hxx b/include/criterion/internal/stdio_filebuf.hxx
index c58bbe11..16546ada 100644
--- a/include/criterion/internal/stdio_filebuf.hxx
+++ b/include/criterion/internal/stdio_filebuf.hxx
@@ -21,6 +21,7 @@
  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  * THE SOFTWARE.
  */
+// IWYU pragma: private, include "criterion/criterion.h"
 #ifndef CRITERION_INTERNAL_STDIO_FILEBUF_HXX_
 #define CRITERION_INTERNAL_STDIO_FILEBUF_HXX_
 
diff --git a/include/criterion/internal/stream.hxx b/include/criterion/internal/stream.hxx
index 2207fc26..3216a2cf 100644
--- a/include/criterion/internal/stream.hxx
+++ b/include/criterion/internal/stream.hxx
@@ -21,6 +21,7 @@
  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  * THE SOFTWARE.
  */
+// IWYU pragma: private, include "criterion/criterion.h"
 #ifndef CRITERION_INTERNAL_STREAM_HXX_
 #define CRITERION_INTERNAL_STREAM_HXX_
 
diff --git a/include/criterion/internal/test.h b/include/criterion/internal/test.h
index 7cce462b..eb1aac45 100644
--- a/include/criterion/internal/test.h
+++ b/include/criterion/internal/test.h
@@ -21,6 +21,7 @@
  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  * THE SOFTWARE.
  */
+// IWYU pragma: private, include "criterion/criterion.h"
 #ifndef CRITERION_INTERNAL_TEST_H_
 #define CRITERION_INTERNAL_TEST_H_
 
diff --git a/include/criterion/internal/theories.h b/include/criterion/internal/theories.h
index 46842f0b..533d5708 100644
--- a/include/criterion/internal/theories.h
+++ b/include/criterion/internal/theories.h
@@ -21,6 +21,7 @@
  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  * THE SOFTWARE.
  */
+// IWYU pragma: private, include "criterion/criterion.h"
 #ifndef CRITERION_INTERNAL_THEORIES_H_
 #define CRITERION_INTERNAL_THEORIES_H_