diff --git a/src/common/stringimpl.cpp b/src/common/stringimpl.cpp
index eb90ea7eae..af847b54e1 100644
--- a/src/common/stringimpl.cpp
+++ b/src/common/stringimpl.cpp
@@ -30,6 +30,7 @@
 
 #ifndef WX_PRECOMP
     #include "wx/stringimpl.h"
+    #include "wx/wxcrt.h"
 #endif
 
 #include <ctype.h>