diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 6d004c5..9432e6a 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -27,7 +27,7 @@ jobs:
         run:
           go test -v -tags=llvm${{ matrix.llvm }}
       - name: Test default LLVM
-        if: matrix.llvm == 21
+        if: matrix.llvm == 20
         run:
           go test -v
   test-linux:
@@ -52,7 +52,7 @@ jobs:
         run:
           go test -v -tags=llvm${{ matrix.llvm }}
       - name: Test default LLVM
-        if: matrix.llvm == 21
+        if: matrix.llvm == 20
         run:
           go test -v
   test-linux-fedora:
@@ -75,6 +75,6 @@ jobs:
         run:
           go test -v -tags=llvm${{ matrix.llvm }}
       - name: Test default LLVM
-        if: matrix.llvm == 21
+        if: matrix.llvm == 20
         run:
           go test -v
diff --git a/llvm_config_llvm20.go b/llvm_config_llvm20.go
index 9c0a350..6741b28 100644
--- a/llvm_config_llvm20.go
+++ b/llvm_config_llvm20.go
@@ -1,4 +1,4 @@
-//go:build !byollvm && llvm20
+//go:build !byollvm && !llvm14 && !llvm15 && !llvm16 && !llvm17 && !llvm18 && !llvm19 && !llvm21
 
 package llvm
 
diff --git a/llvm_config_llvm21.go b/llvm_config_llvm21.go
index e74a1f8..263c2fc 100644
--- a/llvm_config_llvm21.go
+++ b/llvm_config_llvm21.go
@@ -1,4 +1,4 @@
-//go:build !byollvm && !llvm14 && !llvm15 && !llvm16 && !llvm17 && !llvm18 && !llvm19 && !llvm20
+//go:build !byollvm && llvm21
 
 package llvm