diff --git a/.gitattributes b/.gitattributes
new file mode 100644
index 0000000000..991065e069
--- /dev/null
+++ b/.gitattributes
@@ -0,0 +1,4 @@
+# For files generated by trio/_tools/gen_exports.py
+trio/_core/_generated*    linguist-generated=true
+# Treat generated files as binary in git diff
+trio/_core/_generated*    -diff