diff --git a/src/common/strvararg.cpp b/src/common/strvararg.cpp
index 34cac3ca1d..4559748fb4 100644
--- a/src/common/strvararg.cpp
+++ b/src/common/strvararg.cpp
@@ -25,6 +25,7 @@
 
 #include "wx/strvararg.h"
 #include "wx/string.h"
+#include "wx/crt.h"
 
 // ============================================================================
 // implementation