diff --git a/src/lgc.c b/src/lgc.c
index 116a058..d829d2a 100644
--- a/src/lgc.c
+++ b/src/lgc.c
@@ -1624,16 +1624,21 @@ void luaC_inherit_thread(lua_State *L, lua_State *th)
 {
   int i;
   GCheader *steal, *tmp;
+  thr_State *pt;
 
   if (th->heap == NULL) {
     // already done
     return;
   }
 
+  pt = luaC_get_per_thread(L);
+
   /* when a thread is reclaimed, the executing thread
    * needs to steal its contents */
   lock_all_threads();
 
+  block_collector(L, pt);
+
   if (TEST_INHERIT_THREAD_DELAY_MS > 0) {
     /* TR-1945: Both global trace and thread delref will grab
      * the "all threads" lock. To induce false contention on that lock
@@ -1671,6 +1676,8 @@ void luaC_inherit_thread(lua_State *L, lua_State *th)
     make_grey(L, steal);
   }
   TAILQ_REMOVE(&G(L)->all_heaps, th->heap, heaps);
+  unblock_collector(L, pt);
+
   unlock_all_threads();
 
   free(th->heap);