diff --git a/lib/strequal.c b/lib/strequal.c
index 87dbc5d866..cf3db959e2 100644
--- a/lib/strequal.c
+++ b/lib/strequal.c
@@ -38,6 +38,8 @@
  * ------------------------------------------------------------
  ****************************************************************************/
 
+#include <string.h>
+
 #include "setup.h"
 
 int strequal(const char *first, const char *second)