1 files changed, 2 insertions, 0 deletions
diff --git a/enumerator.c b/enumerator.c
index 022690a2a3..3aa0d2ea78 100644
--- a/enumerator.c
+++ b/enumerator.c
@@ -494,6 +494,8 @@ enumerator_with_index(int argc, VALUE *argv, VALUE obj)
     RETURN_SIZED_ENUMERATOR(obj, argc, argv, enumerator_size);
     if (NIL_P(memo))
 	memo = INT2FIX(0);
+    else
+	memo = rb_to_int(memo);
     return enumerator_block_call(obj, enumerator_with_index_i, (VALUE)&memo);
 }