diff --git a/.clang-format-ignore b/.clang-format-ignore
index 00bc2ac424b8..5b0b6656eba3 100644
--- a/.clang-format-ignore
+++ b/.clang-format-ignore
@@ -40,6 +40,10 @@ widget/tests/.*
 xpcom/glue/tests/.*
 xpcom/tests/.*
 
+# Generated by protobuf
+.*/.*.pb.h
+.*/.*.pb.cc
+
 # Generated from ./tools/rewriting/ThirdPartyPaths.txt
 # awk '{print ""$1".*"}' ./tools/rewriting/ThirdPartyPaths.txt
 browser/components/translation/cld2/.*