diff --git a/src/utils/os_unix.c b/src/utils/os_unix.c
index acc697558..800c50772 100644
--- a/src/utils/os_unix.c
+++ b/src/utils/os_unix.c
@@ -1,6 +1,6 @@
 /*
  * OS specific functions for UNIX/POSIX systems
- * Copyright (c) 2005-2009, Jouni Malinen <j@w1.fi>
+ * Copyright (c) 2005-2019, Jouni Malinen <j@w1.fi>
  *
  * This software may be distributed under the terms of the BSD license.
  * See README for more details.
@@ -520,7 +520,7 @@ void * os_memdup(const void *src, size_t len)
 {
 	void *r = os_malloc(len);
 
-	if (r)
+	if (r && src)
 		os_memcpy(r, src, len);
 	return r;
 }