diff --git a/.gitattributes b/.gitattributes
index 15a5c58091..668ebff92c 100644
--- a/.gitattributes
+++ b/.gitattributes
@@ -1 +1,4 @@
 *.h linguist-language=C
+
+# suppress asm/nonmatchings/ in GitHub diffs
+asm/nonmatchings/**/*.s linguist-generated