diff --git a/clang/include/clang/Lex/HeaderSearchOptions.h b/clang/include/clang/Lex/HeaderSearchOptions.h
index d739dc2afa2b..8fecd65726f8 100644
--- a/clang/include/clang/Lex/HeaderSearchOptions.h
+++ b/clang/include/clang/Lex/HeaderSearchOptions.h
@@ -52,17 +52,10 @@ public:
     /// path.
     unsigned IgnoreSysRoot : 1;
 
-    /// \brief True if this entry is an internal search path.
-    ///
-    /// This typically indicates that users didn't directly provide it, but
-    /// instead it was provided by a compatibility layer for a particular
-    /// system.
-    unsigned IsInternal : 1;
-
-    Entry(StringRef path, frontend::IncludeDirGroup group,
-          bool isFramework, bool ignoreSysRoot, bool isInternal)
+    Entry(StringRef path, frontend::IncludeDirGroup group, bool isFramework,
+          bool ignoreSysRoot)
       : Path(path), Group(group), IsFramework(isFramework),
-        IgnoreSysRoot(ignoreSysRoot), IsInternal(isInternal) {}
+        IgnoreSysRoot(ignoreSysRoot) {}
   };
 
   struct SystemHeaderPrefix {
@@ -123,9 +116,8 @@ public:
 
   /// AddPath - Add the \p Path path to the specified \p Group list.
   void AddPath(StringRef Path, frontend::IncludeDirGroup Group,
-               bool IsFramework, bool IgnoreSysRoot, bool IsInternal = false) {
-    UserEntries.push_back(Entry(Path, Group, IsFramework,
-                                IgnoreSysRoot, IsInternal));
+               bool IsFramework, bool IgnoreSysRoot) {
+    UserEntries.push_back(Entry(Path, Group, IsFramework, IgnoreSysRoot));
   }
 
   /// AddSystemHeaderPrefix - Override whether \#include directives naming a
diff --git a/clang/lib/Frontend/CompilerInvocation.cpp b/clang/lib/Frontend/CompilerInvocation.cpp
index 49f89d4c79ee..f49f30d87809 100644
--- a/clang/lib/Frontend/CompilerInvocation.cpp
+++ b/clang/lib/Frontend/CompilerInvocation.cpp
@@ -889,8 +889,7 @@ static void ParseHeaderSearchArgs(HeaderSearchOptions &Opts, ArgList &Args) {
     frontend::IncludeDirGroup Group = frontend::System;
     if ((*I)->getOption().matches(OPT_internal_externc_isystem))
       Group = frontend::ExternCSystem;
-    Opts.AddPath((*I)->getValue(), Group, false, /*IgnoreSysRoot=*/true,
-                 /*IsInternal=*/true);
+    Opts.AddPath((*I)->getValue(), Group, false, true);
   }
 
   // Add the path prefixes which are implicitly treated as being system headers.
diff --git a/clang/lib/Serialization/ASTReader.cpp b/clang/lib/Serialization/ASTReader.cpp
index c07e1e9982f3..ac86d41eb14f 100644
--- a/clang/lib/Serialization/ASTReader.cpp
+++ b/clang/lib/Serialization/ASTReader.cpp
@@ -3691,10 +3691,8 @@ bool ASTReader::ParseHeaderSearchOptions(const RecordData &Record,
       = static_cast<frontend::IncludeDirGroup>(Record[Idx++]);
     bool IsFramework = Record[Idx++];
     bool IgnoreSysRoot = Record[Idx++];
-    bool IsInternal = Record[Idx++];
     HSOpts.UserEntries.push_back(
-      HeaderSearchOptions::Entry(Path, Group, IsFramework, IgnoreSysRoot,
-                                 IsInternal));
+      HeaderSearchOptions::Entry(Path, Group, IsFramework, IgnoreSysRoot));
   }
 
   // System header prefixes.
diff --git a/clang/lib/Serialization/ASTWriter.cpp b/clang/lib/Serialization/ASTWriter.cpp
index 0499f5c6f473..25e3d52f370a 100644
--- a/clang/lib/Serialization/ASTWriter.cpp
+++ b/clang/lib/Serialization/ASTWriter.cpp
@@ -1114,7 +1114,6 @@ void ASTWriter::WriteControlBlock(Preprocessor &PP, ASTContext &Context,
     Record.push_back(static_cast<unsigned>(Entry.Group));
     Record.push_back(Entry.IsFramework);
     Record.push_back(Entry.IgnoreSysRoot);
-    Record.push_back(Entry.IsInternal);
   }
 
   // System header prefixes.