--- a/.clang-format-ignore
+++ b/.clang-format-ignore
@@ -2,16 +2,17 @@
 build/clang-plugin/.*
 # The two templates cannot be formatted
 config/gcc-stl-wrapper.template.h
 config/msvc-stl-wrapper.template.h
 dom/base/test/.*
 dom/bindings/test/.*
 dom/media/gtest/.*
 gfx/testsd/.*
+.*/gtest/ExampleStylesheet.h
 image/test/.*
 ipc/ipdl/test/.*
 ipc/testshell/.*
 js/src/jsapi-tests/.*
 # See bug 1395584
 js/src/vm/Opcodes.h
 # Ignored because of bug 1342657
 layout/style/nsCSSPropAliasList.h