diff --git a/include/flatcc/support/readfile.h b/include/flatcc/support/readfile.h
index 209875fb..a262b215 100644
--- a/include/flatcc/support/readfile.h
+++ b/include/flatcc/support/readfile.h
@@ -32,7 +32,7 @@ static char *readfile(const char *filename, size_t max_size, size_t *size_out)
     if (max_size > 0 && size > max_size) {
         goto fail;
     }
-    rewind(fp);
+    if (fseek(fp, 0L, SEEK_SET)) goto fail;
     buf = (char *)malloc(size ? size : 1);
     if (!buf) {
         goto fail;
diff --git a/src/compiler/fileio.c b/src/compiler/fileio.c
index 56d88c11..c9edaf1b 100644
--- a/src/compiler/fileio.c
+++ b/src/compiler/fileio.c
@@ -197,7 +197,7 @@ char *fb_read_file(const char *filename, size_t max_size, size_t *size_out)
     if (max_size > 0 && size > max_size) {
         goto fail;
     }
-    rewind(fp);
+    if (fseek(fp, 0L, SEEK_SET)) goto fail;
     buf = malloc(size ? size : 1);
     if (!buf) {
         goto fail;