diff --git a/clang/test/Frontend/rewrite-includes-bom.c b/clang/test/Frontend/rewrite-includes-bom.c
index 276c994fb0e7..9a62f4594afd 100644
--- a/clang/test/Frontend/rewrite-includes-bom.c
+++ b/clang/test/Frontend/rewrite-includes-bom.c
@@ -1,5 +1,5 @@
-// RUN: grep '^\xEF\xBB\xBF' %S/Inputs/rewrite-includes-bom.h
-// RUN: %clang_cc1 -E -frewrite-includes -I %S/Inputs %s -o - | %clang_cc1 -fsyntax-only -verify -x c - | not grep '\xEF\xBB\xBF'
+// RUN: grep -E "^\\xEF\\xBB\\xBF" %S/Inputs/rewrite-includes-bom.h
+// RUN: %clang_cc1 -E -frewrite-includes -I %S/Inputs %s -o - | %clang_cc1 -fsyntax-only -verify -x c - | not grep -E "\\xEF\\xBB\\xBF"
 // expected-no-diagnostics
 
 #include "rewrite-includes-bom.h"