diff --git a/src/citymania/cm_main.cpp b/src/citymania/cm_main.cpp
index 6492b6e4ec..33788685f8 100644
--- a/src/citymania/cm_main.cpp
+++ b/src/citymania/cm_main.cpp
@@ -1,6 +1,7 @@
 #include "../stdafx.h"
 
 #include "cm_main.hpp"
+#include "../timer/timer.h"
 
 #include "../safeguards.h"