diff --git a/.gitattributes b/.gitattributes
index 053cc0fcd..663e9664c 100644
--- a/.gitattributes
+++ b/.gitattributes
@@ -1,4 +1,5 @@
 test/diffs linguist-vendored
+test/diffs-todo linguist-vendored
 test/crashers linguist-vendored
 test/crashers-todo linguist-vendored
 vendor linguist-vendored