diff --git "a/base/applications/regedit/childwnd.c" "b/base/applications/regedit/childwnd.c"
index 452313dfea5..c13e9566410 100644
--- "a/base/applications/regedit/childwnd.c"
+++ "b/base/applications/regedit/childwnd.c"
@@ -137,6 +137,7 @@ static void finish_splitbar(HWND hWnd, int x)
     GetClientRect(hWnd, &rt);
     g_pChildWnd->nSplitPos = x;
     ResizeWnd(rt.right, rt.bottom);
+    InvalidateRect(hWnd, &rt, FALSE);
     ReleaseCapture();
 }