diff --git a/include/richedit.h b/include/richedit.h
index 6b27fc93ecc..ce2c145c881 100644
--- a/include/richedit.h
+++ b/include/richedit.h
@@ -691,7 +691,7 @@ typedef struct _reqresize {
 
 typedef struct _repastespecial {
     DWORD      dwAspect;
-    DWORD      dwParam;
+    DWORD_PTR  dwParam;
 } REPASTESPECIAL;
 
 typedef struct _punctuation {