1 files changed, 1 insertions, 1 deletions
diff --git a/thread.c b/thread.c
index 122fe30fd0..609e726620 100644
--- a/thread.c
+++ b/thread.c
@@ -2163,7 +2163,7 @@ thread_keys_i(ID key, VALUE value, VALUE ary)
 static int
 vm_living_thread_num(rb_vm_t *vm)
 {
-    return vm->living_threads->num_entries;
+    return (int)vm->living_threads->num_entries;
 }
 
 int