diff --git a/src/stratagus/util.cpp b/src/stratagus/util.cpp
index 4ef18e196..18f85343d 100644
--- a/src/stratagus/util.cpp
+++ b/src/stratagus/util.cpp
@@ -35,6 +35,7 @@
 #include <errno.h>
 #include <stdio.h>
 #include <stdlib.h>
+#include <stdarg.h>
 
 #ifdef WIN32
 #include <windows.h>