diff --git a/reactos/win32ss/user/ntuser/clipboard.c b/reactos/win32ss/user/ntuser/clipboard.c
index b9ba6f952a9..e6809f4087a 100644
--- a/reactos/win32ss/user/ntuser/clipboard.c
+++ b/reactos/win32ss/user/ntuser/clipboard.c
@@ -180,7 +180,7 @@ IntSynthesizeDib(
                                                       NULL,
                                                       &hMem,
                                                       TYPE_CLIPDATA,
-                                                      cjDataSize);
+                                                      sizeof(CLIPBOARDDATA) + cjDataSize);
     if (!pClipboardData)
     {
         goto cleanup;