diff --git a/client/common.h b/client/common.h
index ca3609f8..13ef1c7a 100644
--- a/client/common.h
+++ b/client/common.h
@@ -31,6 +31,7 @@
 #endif
 
 #include <stdio.h>
+#include <stdarg.h>
 #include <string>
 #include <vector>
 #include <map>