diff --git a/include/llvm/ProfileData/InstrProf.h b/include/llvm/ProfileData/InstrProf.h
index c803069c469..e2291ef2a9b 100644
--- a/include/llvm/ProfileData/InstrProf.h
+++ b/include/llvm/ProfileData/InstrProf.h
@@ -13,8 +13,8 @@
 //
 //===----------------------------------------------------------------------===//
 
-#ifndef LLVM_PROFILEDATA_INSTRPROF_H__
-#define LLVM_PROFILEDATA_INSTRPROF_H__
+#ifndef LLVM_PROFILEDATA_INSTRPROF_H_
+#define LLVM_PROFILEDATA_INSTRPROF_H_
 
 #include "llvm/Support/system_error.h"
 
@@ -52,4 +52,4 @@ template <> struct is_error_code_enum<instrprof_error::ErrorType>
 
 } // end namespace llvm
 
-#endif // LLVM_PROFILEDATA_INSTRPROF_H__
+#endif // LLVM_PROFILEDATA_INSTRPROF_H_
diff --git a/include/llvm/ProfileData/InstrProfReader.h b/include/llvm/ProfileData/InstrProfReader.h
index 1c7c5ced82c..e2c59cf186b 100644
--- a/include/llvm/ProfileData/InstrProfReader.h
+++ b/include/llvm/ProfileData/InstrProfReader.h
@@ -12,8 +12,8 @@
 //
 //===----------------------------------------------------------------------===//
 
-#ifndef LLVM_PROFILEDATA_INSTRPROF_READER_H__
-#define LLVM_PROFILEDATA_INSTRPROF_READER_H__
+#ifndef LLVM_PROFILEDATA_INSTRPROF_READER_H_
+#define LLVM_PROFILEDATA_INSTRPROF_READER_H_
 
 #include "llvm/ADT/ArrayRef.h"
 #include "llvm/ProfileData/InstrProf.h"
@@ -184,4 +184,4 @@ private:
 
 } // end namespace llvm
 
-#endif // LLVM_PROFILEDATA_INSTRPROF_READER_H__
+#endif // LLVM_PROFILEDATA_INSTRPROF_READER_H_
diff --git a/include/llvm/ProfileData/InstrProfWriter.h b/include/llvm/ProfileData/InstrProfWriter.h
index 388921e2660..f818fa08fa7 100644
--- a/include/llvm/ProfileData/InstrProfWriter.h
+++ b/include/llvm/ProfileData/InstrProfWriter.h
@@ -12,8 +12,8 @@
 //
 //===----------------------------------------------------------------------===//
 
-#ifndef LLVM_PROFILEDATA_INSTRPROF_WRITER_H__
-#define LLVM_PROFILEDATA_INSTRPROF_WRITER_H__
+#ifndef LLVM_PROFILEDATA_INSTRPROF_WRITER_H_
+#define LLVM_PROFILEDATA_INSTRPROF_WRITER_H_
 
 #include "llvm/ADT/ArrayRef.h"
 #include "llvm/ADT/StringMap.h"
@@ -46,4 +46,4 @@ public:
 
 } // end namespace llvm
 
-#endif // LLVM_PROFILE_INSTRPROF_WRITER_H__
+#endif // LLVM_PROFILE_INSTRPROF_WRITER_H_