diff --git a/reactos/subsystems/win32/win32k/ntuser/winpos.c b/reactos/subsystems/win32/win32k/ntuser/winpos.c
index 1eba7c324b1..c4cebef68d4 100644
--- a/reactos/subsystems/win32/win32k/ntuser/winpos.c
+++ b/reactos/subsystems/win32/win32k/ntuser/winpos.c
@@ -1223,11 +1223,20 @@ co_WinPosSetWindowPos(
          }
          if (RgnType != ERROR && RgnType != NULLREGION)
          {
+            PWINDOW_OBJECT Parent = Window->Parent;
             NtGdiOffsetRgn(DirtyRgn,
                            Window->WindowRect.left,
                            Window->WindowRect.top);
+            if ((Window->Style & WS_CHILD) &&
+                (Parent) &&
+                !(Parent->Style & WS_CLIPCHILDREN))
+            {
+               IntInvalidateWindows(Parent, DirtyRgn,
+                  RDW_ERASE | RDW_INVALIDATE);
+               co_IntPaintWindows(Parent, RDW_ERASENOW, FALSE);
+            }
             IntInvalidateWindows(Window, DirtyRgn,
-               RDW_ERASE | RDW_FRAME | RDW_INVALIDATE | RDW_ALLCHILDREN);
+                RDW_ERASE | RDW_FRAME | RDW_INVALIDATE | RDW_ALLCHILDREN);
          }
          NtGdiDeleteObject(DirtyRgn);
       }