1 files changed, 1 insertions, 1 deletions
diff --git a/src/vm.c b/src/vm.c
index 696b566c8..ca31f6675 100644
--- a/src/vm.c
+++ b/src/vm.c
@@ -58,7 +58,7 @@ The value below allows about 60000 recursive calls in the simplest case. */
 static inline void
 stack_copy(mrb_value *dst, const mrb_value *src, size_t size)
 {
-  int i;
+  size_t i;
 
   for (i = 0; i < size; i++) {
     dst[i] = src[i];