diff --git a/3rd/lua/lapi.c b/3rd/lua/lapi.c
index d8ee0386..1450598c 100644
--- a/3rd/lua/lapi.c
+++ b/3rd/lua/lapi.c
@@ -534,6 +534,7 @@ LUA_API void lua_pushcclosure (lua_State *L, lua_CFunction fn, int n) {
   lua_lock(L);
   if (n == 0) {
     setfvalue(L->top, fn);
+    api_incr_top(L);
   }
   else {
     CClosure *cl;
@@ -547,9 +548,9 @@ LUA_API void lua_pushcclosure (lua_State *L, lua_CFunction fn, int n) {
       /* does not need barrier because closure is white */
     }
     setclCvalue(L, L->top, cl);
+    api_incr_top(L);
+    luaC_checkGC(L);
   }
-  api_incr_top(L);
-  luaC_checkGC(L);
   lua_unlock(L);
 }