1 files changed, 1 insertions, 0 deletions
diff --git a/eval.c b/eval.c
index df4bfce42a..516357aab4 100644
--- a/eval.c
+++ b/eval.c
@@ -6984,6 +6984,7 @@ block_pass(self, node)
     /* PUSH BLOCK from data */
     old_block = ruby_block;
     _block = *data;
+    _block.prev = old_block;
     ruby_block = &_block;
     PUSH_ITER(ITER_PRE);
     ruby_frame->iter = ITER_PRE;