Index: uspace/lib/c/test/string.c
===================================================================
--- uspace/lib/c/test/string.c	(revision 7d7f5e3e22d4a07e37e90f73a61193fc2a664b39)
+++ uspace/lib/c/test/string.c	(revision e8c235b62e6ca50363eec4203e0eaf46ad9bea3e)
@@ -799,5 +799,11 @@
 PCUT_TEST(strndup_nonempty_short)
 {
+#pragma GCC diagnostic push
+	// Intentionally checking it works with _longer_ size than actual
+#if defined(__GNUC__) && (__GNUC__ >= 11)
+#pragma GCC diagnostic ignored "-Wstringop-overread"
+#endif
 	char *d = strndup("abc", 5);
+#pragma GCC diagnostic pop
 	PCUT_ASSERT_NOT_NULL(d);
 	PCUT_ASSERT_TRUE(d[0] == 'a');