Index: /trunk/source/lisp-kernel/x86-exceptions.c
===================================================================
--- /trunk/source/lisp-kernel/x86-exceptions.c	(revision 13881)
+++ /trunk/source/lisp-kernel/x86-exceptions.c	(revision 13882)
@@ -241,4 +241,5 @@
     if ((signed_natural)arg >= 0) {
       lisp_heap_notify_threshold = arg;
+      did_gc_notification_since_last_full_gc = false;
     }
     /* fall through */