diff --git a/src/boot/be/x86.ml b/src/boot/be/x86.ml
index 0d0206d7fc4..7e1614a6b3f 100644
--- a/src/boot/be/x86.ml
+++ b/src/boot/be/x86.ml
@@ -784,7 +784,8 @@ let crawl_stack_calling_glue
          (codefix skip_jmp_fix));       (* if glue-fn is nonzero        *)
     add ecx esi;                        (* add crate ptr to disp.       *)
     push (ro ebp);                      (* frame-arg                    *)
-    push (c task_ptr);                  (* form usual call to glue      *)
+    push (immi 0L);                     (* null closure-ptr             *)
+    push (c task_ptr);                  (* self-task ptr                *)
     push (immi 0L);                     (* outptr                       *)
     emit (Il.call (rc eax)
             (reg_codeptr (h ecx)));     (* call glue_fn, trashing eax.  *)