Index: sys/vm/vm_page.c
===================================================================
--- sys/vm/vm_page.c	(revision 340914)
+++ sys/vm/vm_page.c	(working copy)
@@ -304,6 +304,8 @@
 
 	mtx_lock(&vm_page_queue_free_mtx);
 	ret = vm_phys_unfree_page(m);
+	if (ret != 0)
+		vm_phys_freecnt_adj(m, -1);
 	mtx_unlock(&vm_page_queue_free_mtx);
 	if (ret) {
 		TAILQ_INSERT_TAIL(&blacklist_head, m, listq);