1 files changed, 1 insertions, 2 deletions
diff --git a/cont.c b/cont.c
index 2cbabba489..8f222dfef8 100644
--- a/cont.c
+++ b/cont.c
@@ -2569,11 +2569,10 @@ rb_fiber_start(rb_fiber_t *fiber)
 void
 rb_threadptr_root_fiber_setup(rb_thread_t *th)
 {
-    rb_fiber_t *fiber = ruby_mimmalloc(sizeof(rb_fiber_t));
+    rb_fiber_t *fiber = ruby_mimcalloc(1, sizeof(rb_fiber_t));
     if (!fiber) {
         rb_bug("%s", strerror(errno)); /* ... is it possible to call rb_bug here? */
     }
-    MEMZERO(fiber, rb_fiber_t, 1);
     fiber->cont.type = FIBER_CONTEXT;
     fiber->cont.saved_ec.fiber_ptr = fiber;
     fiber->cont.saved_ec.thread_ptr = th;