1 files changed, 3 insertions, 1 deletions
diff --git a/src/gc.c b/src/gc.c
index 6454b10c5..f8d25e5ec 100644
--- a/src/gc.c
+++ b/src/gc.c
@@ -542,7 +542,9 @@ obj_free(mrb_state *mrb, struct RBasic *obj)
 static void
 root_scan_phase(mrb_state *mrb)
 {
-  int i, j, e;
+  int j;
+  size_t i;
+  size_t e;
   mrb_callinfo *ci;
 
   if (!is_minor_gc(mrb)) {