diff --git a/library/ssl_misc.h b/library/ssl_misc.h
index 816beea..c17fa20 100644
--- a/library/ssl_misc.h
+++ b/library/ssl_misc.h
@@ -410,7 +410,7 @@
     }
     return( 0 );
 }
-#endif
+#endif /* MBEDTLS_TEST_HOOKS */
 
 /**
  * \brief        This macro checks if the remaining size in a buffer is