diff --git a/ansi-tests/format-t.lsp b/ansi-tests/format-t.lsp
index 32ee2337997a7f3c982de54688ff0d9f949e8dbd..3be57ddaba7298d5f6bb2276b03d1e5e3b85bfa4 100644
--- a/ansi-tests/format-t.lsp
+++ b/ansi-tests/format-t.lsp
@@ -323,7 +323,8 @@
 
 (def-pprint-test format.\:@t.4
   (format nil "XX~10,20:@tYY")
-  "XXYY")
+  "XXYY"
+  :pretty nil)
 
 (def-pprint-test format.\:@t.5
   (with-output-to-string