diff --git a/compat/nedmalloc/nedmalloc.c b/compat/nedmalloc/nedmalloc.c
index 677d1b2794..3f28c0b818 100644
--- a/compat/nedmalloc/nedmalloc.c
+++ b/compat/nedmalloc/nedmalloc.c
@@ -956,6 +956,9 @@ void **nedpindependent_comalloc(nedpool *p, size_t elems, size_t *sizes, void **
 char *strdup(const char *s1)
 {
 	char *s2 = 0;
+#if __GNUC__ >= 6
+#pragma GCC diagnostic ignored "-Wnonnull-compare"
+#endif
 	if (s1) {
 		size_t len = strlen(s1) + 1;
 		s2 = malloc(len);