diff --git a/src/lj_bcwrite.c b/src/lj_bcwrite.c
index c062dc49..ddfa46c5 100644
--- a/src/lj_bcwrite.c
+++ b/src/lj_bcwrite.c
@@ -133,7 +133,7 @@ static void bcwrite_ktab_sorted_hash(BCWriteCtx *ctx, Node *node, MSize nhash)
   TValue **heap = ctx->heap;
   MSize i = nhash;
   for (;; node--) {  /* Build heap. */
-    if (!tvisnil(&node->val)) {
+    if (!tvisnil(&node->key)) {
       bcwrite_ktabk_heap_insert(heap, --i, nhash, &node->key);
       if (i == 0) break;
     }
@@ -163,7 +163,7 @@ static void bcwrite_ktab(BCWriteCtx *ctx, char *p, const GCtab *t)
     MSize i, hmask = t->hmask;
     Node *node = noderef(t->node);
     for (i = 0; i <= hmask; i++)
-      nhash += !tvisnil(&node[i].val);
+      nhash += !tvisnil(&node[i].key);
   }
   /* Write number of array slots and hash slots. */
   p = lj_strfmt_wuleb128(p, narray);
@@ -184,7 +184,7 @@ static void bcwrite_ktab(BCWriteCtx *ctx, char *p, const GCtab *t)
     } else {
       MSize i = nhash;
       for (;; node--)
-	if (!tvisnil(&node->val)) {
+	if (!tvisnil(&node->key)) {
 	  bcwrite_ktabk(ctx, &node->key, 0);
 	  bcwrite_ktabk(ctx, &node->val, 1);
 	  if (--i == 0) break;