1 files changed, 1 insertions, 1 deletions
diff --git a/vm.c b/vm.c
index f66122b0a8..ae0148e852 100644
--- a/vm.c
+++ b/vm.c
@@ -1696,7 +1696,7 @@ rb_vm_mark(void *ptr)
     RUBY_GC_INFO("-------------------------------------------------\n");
     if (ptr) {
 	rb_vm_t *vm = ptr;
-	rb_thread_t *th;
+	rb_thread_t *th = 0;
 
 	list_for_each(&vm->living_threads, th, vmlt_node) {
 	    rb_gc_mark(th->self);