diff --git a/sdk/include/reactos/comctl32_undoc.h b/sdk/include/reactos/comctl32_undoc.h
index 49d68006ab9..45a4aef6fbe 100644
--- a/sdk/include/reactos/comctl32_undoc.h
+++ b/sdk/include/reactos/comctl32_undoc.h
@@ -34,7 +34,7 @@ extern "C" {
 
 typedef INT (CALLBACK *MRUCMPPROCA)(LPCSTR, LPCSTR);
 typedef INT (CALLBACK *MRUCMPPROCW)(LPCWSTR, LPCWSTR);
-typedef INT (CALLBACK *MRUBINARYCMPPROC)(LPCVOID, LPCVOID);
+typedef INT (CALLBACK *MRUBINARYCMPPROC)(LPCVOID, LPCVOID, DWORD);
 
 typedef struct _MRUINFOA
 {