diff --git a/library/aesni.c b/library/aesni.c
index 2d5ed9e0ca..786dbd92fc 100644
--- a/library/aesni.c
+++ b/library/aesni.c
@@ -26,13 +26,6 @@
 
 #if defined(MBEDTLS_AESNI_C)
 
-#if defined(__has_feature)
-#if __has_feature(memory_sanitizer)
-#warning \
-    "MBEDTLS_AESNI_C is known to cause spurious error reports with some memory sanitizers as they do not understand the assembly code."
-#endif
-#endif
-
 #include "aesni.h"
 
 #include <string.h>
@@ -59,6 +52,13 @@ int mbedtls_aesni_has_support(unsigned int what)
     return (c & what) != 0;
 }
 
+#if defined(__has_feature)
+#if __has_feature(memory_sanitizer)
+#warning \
+    "MBEDTLS_AESNI_C is known to cause spurious error reports with some memory sanitizers as they do not understand the assembly code."
+#endif
+#endif
+
 /*
  * Binutils needs to be at least 2.19 to support AES-NI instructions.
  * Unfortunately, a lot of users have a lower version now (2014-04).