Index: test/clang-tidy/explain-checks.cpp
===================================================================
--- test/clang-tidy/explain-checks.cpp
+++ test/clang-tidy/explain-checks.cpp
@@ -4,7 +4,7 @@
 // RUN: clang-tidy -checks=modernize-use-nullptr -config="{Checks: '-*,-modernize-use-nullptr'}" %S/Inputs/explain-config/a.cc -explain-config | FileCheck --check-prefix=CHECK-MESSAGE4 %s
 // RUN: clang-tidy -checks=modernize-use-nullptr -config="{Checks: '-*,modernize-*'}" -explain-config | FileCheck --check-prefix=CHECK-MESSAGE5 %s
 // RUN: clang-tidy -config="{Checks: 'modernize-use-nullptr'}" -explain-config | FileCheck --check-prefix=CHECK-MESSAGE6 %s
-// RUN: clang-tidy -explain-config %S/Inputs/explain-config/a.cc | grep "'modernize-use-nullptr' is enabled in the %S/Inputs/explain-config/.clang-tidy."
+// RUN: clang-tidy -explain-config %S/Inputs/explain-config/a.cc -- | grep "'modernize-use-nullptr' is enabled in the %S/Inputs/explain-config/.clang-tidy."
 
 // CHECK-MESSAGE1: 'modernize-use-nullptr' is enabled in the command-line option '-checks'.
 // CHECK-MESSAGE2: 'modernize-use-nullptr' is enabled in the command-line option '-config'.