diff --git a/include/winuser.h b/include/winuser.h
index 7a5eb3a762847a8d5f8d0c5a0242bf465ae0324b..eada59064ba816a242fb2b8123c78aa4902a2d87 100644
--- a/include/winuser.h
+++ b/include/winuser.h
@@ -1157,7 +1157,7 @@ typedef struct
 {
     UINT16  mkSize;
     BYTE    mkKeyList;
-    BYTE    szKeyPhrase[1];
+    BYTE    szKeyphrase[1];
 } MULTIKEYHELP, *LPMULTIKEYHELP;
 
 typedef struct {