diff --git a/src/p_setup.c b/src/p_setup.c
index 482330599..66d7bff42 100644
--- a/src/p_setup.c
+++ b/src/p_setup.c
@@ -6718,7 +6718,7 @@ static void P_ConvertBinaryThingTypes(void)
 		}
 		
 		// Clear binary thing height hacks, to prevent interfering with UDMF-only flags
-		mapthings[i].options &= 8;
+		mapthings[i].options &= 0xF;
 	}
 }