1 files changed, 3 insertions, 2 deletions

diff --git a/lfunc.c b/lfunc.c
index 10100e5a..f8c3c446 100644
--- a/lfunc.c
+++ b/lfunc.c
@@ -234,9 +234,10 @@ int luaF_close (lua_State *L, StkId level, int status) {
     luaF_unlinkupval(uv);
     setobj(L, slot, uv->v);  /* move value to upvalue slot */
     uv->v = slot;  /* now current value lives here */
-    if (!iswhite(uv))
+    if (!iswhite(uv)) {  /* neither white nor dead? */
       gray2black(uv);  /* closed upvalues cannot be gray */
-    luaC_barrier(L, uv, slot);
+      luaC_barrier(L, uv, slot);
+    }
   }
   return status;
 }