diff --git a/src/engine/server/server.cpp b/src/engine/server/server.cpp
index 65bb231a6..193547ccf 100644
--- a/src/engine/server/server.cpp
+++ b/src/engine/server/server.cpp
@@ -1,6 +1,7 @@
 /* (c) Magnus Auvinen. See licence.txt in the root of the distribution for more information. */
 /* If you are missing that file, acquire a complete release at teeworlds.com.                */
 
+#include <base/math.h>
 #include <base/system.h>
 
 #include <engine/config.h>