diff --git a/include/wine/unicode.h b/include/wine/unicode.h
index bea60989ae4..ac4252b7c08 100644
--- a/include/wine/unicode.h
+++ b/include/wine/unicode.h
@@ -24,6 +24,7 @@
 #include <stdarg.h>
 
 #include "windef.h"
+#include "winbase.h"
 #include "winnls.h"
 
 /* code page info common to SBCS and DBCS */