diff --git a/test/multipart b/test/multipart
index 0527f848..344ed81a 100755
--- a/test/multipart
+++ b/test/multipart
@@ -630,7 +630,7 @@ cat <<EOF >EXPECTED
  "content": "This is an embedded message, with a multipart/alternative part.\n"}]}]}]},
  {"id": 7,
  "content-type": "text/plain",
- "filename": "YYYYY",
+ "filename": "attachment",
  "content": "This is a text attachment.\n"},
  {"id": 8,
  "content-type": "text/plain",
diff --git a/test/test-lib.sh b/test/test-lib.sh
index fd64736b..6ce3b318 100644
--- a/test/test-lib.sh
+++ b/test/test-lib.sh
@@ -600,7 +600,7 @@ notmuch_json_show_sanitize ()
 {
     sed \
 	-e 's|"id": "[^"]*",|"id": "XXXXX",|g' \
-	-e 's|"filename": "[^"]*",|"filename": "YYYYY",|g'
+	-e 's|"filename": "/[^"]*",|"filename": "YYYYY",|g'
 }
 
 # End of notmuch helper functions