diff --git a/zone/water_map.cpp b/zone/water_map.cpp
index 427277b73..d0bfa9999 100644
--- a/zone/water_map.cpp
+++ b/zone/water_map.cpp
@@ -1,5 +1,6 @@
 #include "../common/debug.h"
 #include <stdio.h>
+#include <string.h>
 #include <algorithm>
 #include <functional>
 #include <cctype>