diff --git a/sys/vm/swap_pager.c b/sys/vm/swap_pager.c
--- a/sys/vm/swap_pager.c
+++ b/sys/vm/swap_pager.c
@@ -1890,8 +1890,8 @@
 			if (rv != VM_PAGER_OK)
 				panic("%s: read from swap failed: %d",
 				    __func__, rv);
-			vm_object_pip_wakeupn(object, 1);
 			VM_OBJECT_WLOCK(object);
+			vm_object_pip_wakeupn(object, 1);
 			vm_page_xunbusy(m);
 
 			/*