diff --git a/Source/am_map.c b/Source/am_map.c
index e935a47c..5e0a56d4 100644
--- a/Source/am_map.c
+++ b/Source/am_map.c
@@ -1472,9 +1472,13 @@ void AM_drawWalls(void)
           (lines[i].special>=GenLockedBase && lines[i].special<GenDoorBase))
         )
         {
+    // Remove the closed door check for flashing keyed switches feature
+    // from Crispy Doom.
+#if 0
           if ((lines[i].backsector->floorheight==lines[i].backsector->ceilingheight) ||
               (lines[i].frontsector->floorheight==lines[i].frontsector->ceilingheight))
           {
+#endif
             if (map_keyed_door_flash && (leveltime & 16))
             {
                AM_drawMline(&l, mapcolor_grid);
@@ -1502,8 +1506,10 @@ void AM_drawWalls(void)
                   mapcolor_clsd? mapcolor_clsd : mapcolor_cchg);
                 break;
             }
+#if 0
           }
           else AM_drawMline(&l, mapcolor_cchg); // open keyed door
+#endif
         }
         else if (lines[i].flags & ML_SECRET)    // secret door
         {