diff --git a/src/p_mobj.c b/src/p_mobj.c
index 9ec667346..7a089a956 100644
--- a/src/p_mobj.c
+++ b/src/p_mobj.c
@@ -10882,6 +10882,9 @@ mobj_t *P_SpawnMobj(fixed_t x, fixed_t y, fixed_t z, mobjtype_t type, ...)
 	// increment mobj reference, so we don't get a dangling reference in case MobjSpawn calls P_RemoveMobj
 	mobj->thinker.references++;
 
+	if (!(mobj->flags & MF_NOTHINK))
+		P_AddThinker(THINK_MOBJ, &mobj->thinker);
+
 	// DANGER! This can cause P_SpawnMobj to return NULL!
 	// Avoid using P_RemoveMobj on the newly created mobj in "MobjSpawn" Lua hooks!
 	status = LUA_HookMobj(mobj, MOBJ_HOOK(MobjSpawn));