diff --git a/configure.ac b/configure.ac
index 9be350e9e..6da1415b0 100644
--- a/configure.ac
+++ b/configure.ac
@@ -749,6 +749,8 @@ AM_COND_IF([DEBUG],
 	CHARYBDIS_C_GCC_TRY_FLAGS([-Wsuggest-final-types], charybdis_cv_c_gcc_w_suggest_final_types)
 	CHARYBDIS_C_GCC_TRY_FLAGS([-Wsuggest-final-methods], charybdis_cv_c_gcc_w_suggest_final_methods)
 	CHARYBDIS_C_GCC_TRY_FLAGS([-Wsuggest-override], charybdis_cv_c_gcc_w_suggest_override)
+], [
+	CHARYBDIS_C_GCC_TRY_FLAGS([-Wno-unknown-attributes], charybdis_cv_c_gcc_w_unknown_attributes)
 ])
 
 dnl