diff --git a/src/m_cheat.c b/src/m_cheat.c
index 2fe4552ff..a3f6d3daf 100644
--- a/src/m_cheat.c
+++ b/src/m_cheat.c
@@ -1108,6 +1108,10 @@ static mapthing_t *OP_CreateNewMapThing(player_t *player, UINT16 type, boolean c
 
 	mt->options = (mt->z << ZSHIFT) | (UINT16)cv_opflags.value;
 	mt->scale = player->mo->scale;
+	mt->tag = 0;
+	memset(mt->args, 0, NUMMAPTHINGARGS*sizeof(*mt->args));
+	memset(mt->stringargs, 0x00, NUMMAPTHINGSTRINGARGS*sizeof(*mt->stringargs));
+	mt->pitch = mt->roll = 0;
 	return mt;
 }