1 files changed, 2 insertions, 2 deletions
diff --git a/src/gc.c b/src/gc.c
index 4c50b11da..8bd8243f1 100644
--- a/src/gc.c
+++ b/src/gc.c
@@ -532,9 +532,9 @@ gc_mark_children(mrb_state *mrb, struct RBasic *obj)
       struct REnv *e = (struct REnv*)obj;
 
       if (!MRB_ENV_STACK_SHARED_P(e)) {
-        int i, len;
+        mrb_int i, len;
 
-        len = (int)MRB_ENV_STACK_LEN(e);
+        len = MRB_ENV_STACK_LEN(e);
         for (i=0; i<len; i++) {
           mrb_gc_mark_value(mrb, e->stack[i]);
         }