diff --git a/include/haproxy/bug.h b/include/haproxy/bug.h
index a2a9f6d..445dd7c 100644
--- a/include/haproxy/bug.h
+++ b/include/haproxy/bug.h
@@ -42,8 +42,10 @@
 #if __GNUC_PREREQ__(5, 0)
 #pragma GCC diagnostic push
 #pragma GCC diagnostic ignored "-Warray-bounds"
+#if __GNUC_PREREQ__(6, 0)
 #pragma GCC diagnostic ignored "-Wnull-dereference"
 #endif
+#endif
 	*(volatile char *)1 = 0;
 #if __GNUC_PREREQ__(5, 0)
 #pragma GCC diagnostic pop