1 files changed, 1 insertions, 1 deletions
diff --git a/array.c b/array.c
index 90fad544f1..e5de0841aa 100644
--- a/array.c
+++ b/array.c
@@ -5269,7 +5269,7 @@ static VALUE
 flatten(VALUE ary, int level)
 {
     long i;
-    VALUE stack, result, tmp, elt, vmemo;
+    VALUE stack, result, tmp = 0, elt, vmemo;
     st_table *memo;
     st_data_t id;