1 files changed, 1 insertions, 1 deletions
diff --git a/eval.c b/eval.c
index d2a2556494..1df4d28841 100644
--- a/eval.c
+++ b/eval.c
@@ -10548,7 +10548,7 @@ rb_thread_save_context(th)
     rb_thread_t th;
 {
     VALUE *pos;
-    int len;
+    size_t len;
     static VALUE tval;
 
     len = ruby_stack_length(&pos);