diff --git a/reactos/subsystems/win32/win32k/ntuser/windc.c b/reactos/subsystems/win32/win32k/ntuser/windc.c
index 5265ba24624..5e943fc251e 100644
--- a/reactos/subsystems/win32/win32k/ntuser/windc.c
+++ b/reactos/subsystems/win32/win32k/ntuser/windc.c
@@ -730,7 +730,7 @@ DceFreeWindowDCE(PWND Window)
            else
            {
               DPRINT1("Not POWNED or CLASSDC hwndCurrent -> %x \n", pDCE->hwndCurrent);
-              //ASSERT(FALSE);
+              ASSERT(FALSE);
            }
         }
         else