diff --git a/src/network/lookup_ipliteral.c b/src/network/lookup_ipliteral.c
index 8dacffc1..7bcb85fc 100644
--- a/src/network/lookup_ipliteral.c
+++ b/src/network/lookup_ipliteral.c
@@ -5,6 +5,7 @@
 #include <arpa/inet.h>
 #include <limits.h>
 #include <stdlib.h>
+#include <string.h>
 #include <ctype.h>
 #include "lookup.h"