diff --git a/vm.c b/vm.c
index 9897bc37b1..2aea296720 100644
--- a/vm.c
+++ b/vm.c
@@ -682,7 +682,7 @@ static VALUE
 vm_invoke_proc(rb_thread_t *th, rb_proc_t *proc, VALUE self, VALUE defined_class,
 	       int argc, const VALUE *argv, const rb_block_t *blockptr)
 {
-    volatile VALUE val = Qundef;
+    VALUE val = Qundef;
     int state;
     volatile int stored_safe = th->safe_level;