diff --git a/src/gmp_port_lists.c b/src/gmp_port_lists.c
index 701ebfc35..16df1cdc0 100644
--- a/src/gmp_port_lists.c
+++ b/src/gmp_port_lists.c
@@ -30,6 +30,10 @@
 #include "manage_port_lists.h"
 #include "utils.h"
 
+#include <stdlib.h>
+#include <string.h>
+#include <strings.h>
+
 
 /* CREATE_PORT_LIST. */