1 files changed, 3 insertions, 5 deletions
diff --git a/process.c b/process.c
index 5601d82cdc..c1c8432a45 100644
--- a/process.c
+++ b/process.c
@@ -2358,11 +2358,9 @@ open_func(void *ptr)
 static void
 rb_execarg_allocate_dup2_tmpbuf(struct rb_execarg *eargp, long len)
 {
-    eargp->dup2_tmpbuf =
-        rb_imemo_tmpbuf_auto_free_pointer(
-            ruby_xmalloc(
-                run_exec_dup2_tmpbuf_size(
-                    len)));
+    VALUE tmpbuf = rb_imemo_tmpbuf_auto_free_pointer(NULL);
+    ((rb_imemo_tmpbuf_t *)tmpbuf)->ptr = ruby_xmalloc(run_exec_dup2_tmpbuf_size(len));
+    eargp->dup2_tmpbuf = tmpbuf;
 }
 
 static VALUE