diff --git a/src/msw/window.cpp b/src/msw/window.cpp
index 332e309cde..c9015b7469 100644
--- a/src/msw/window.cpp
+++ b/src/msw/window.cpp
@@ -166,6 +166,10 @@
     #define wxHAS_XBUTTON
 #endif
 
+#ifndef MAPVK_VK_TO_CHAR
+    #define MAPVK_VK_TO_CHAR 2
+#endif
+
 // ---------------------------------------------------------------------------
 // global variables
 // ---------------------------------------------------------------------------