diff --git a/.gitattributes b/.gitattributes
index 991065e069..7fbcb4fe2d 100644
--- a/.gitattributes
+++ b/.gitattributes
@@ -2,3 +2,5 @@
 trio/_core/_generated*    linguist-generated=true
 # Treat generated files as binary in git diff
 trio/_core/_generated*    -diff
+# don't merge the generated json file, let the user (script) handle it
+trio/_tests/verify_types.json merge=binary