diff --git a/.gitattributes b/.gitattributes
index 07f430e9441..a217cb7bfe9 100644
--- a/.gitattributes
+++ b/.gitattributes
@@ -1,3 +1,4 @@
 *.c.inc         diff=c
 *.h.inc         diff=c
+*.m             diff=objc
 *.py            diff=python