diff --git a/src/testdir/test_zip_plugin.vim b/src/testdir/test_zip_plugin.vim
index 4e8eff4..3579a46 100644
--- a/src/testdir/test_zip_plugin.vim
+++ b/src/testdir/test_zip_plugin.vim
@@ -10,8 +10,6 @@
 runtime plugin/zipPlugin.vim
 
 def Test_zip_basic()
-  var _sl = &shellslash
-  set noshellslash
 
   ### get our zip file
   if !filecopy("samples/test.zip", "X.zip")
@@ -134,6 +132,4 @@
 
   bw
 
-  &shellslash = _sl
-
 enddef
diff --git a/src/version.c b/src/version.c
index 3a6faeb..c4ade6f 100644
--- a/src/version.c
+++ b/src/version.c
@@ -705,6 +705,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    663,
+/**/
     662,
 /**/
     661,