diff --git a/src/tools/map_extractor/loadlib/loadlib.h b/src/tools/map_extractor/loadlib/loadlib.h
index 1a3dd237b05..e8bd714e4ad 100644
--- a/src/tools/map_extractor/loadlib/loadlib.h
+++ b/src/tools/map_extractor/loadlib/loadlib.h
@@ -25,6 +25,7 @@
 #endif
 #include "CascLib.h"
 #include <map>
+#include <string>
 
 #ifndef _WIN32
 int GetLastError();