diff --git a/clang/include/clang-c/Index.h b/clang/include/clang-c/Index.h
index 86926bd683ba8feea6a2f1703f0276acdd88ea02..ef779d622a8a1a52041f44858ddb5923d75555e9 100644
--- a/clang/include/clang-c/Index.h
+++ b/clang/include/clang-c/Index.h
@@ -342,12 +342,6 @@ CINDEX_LINKAGE CXSourceLocation clang_getRangeStart(CXSourceRange range);
  */
 CINDEX_LINKAGE CXSourceLocation clang_getRangeEnd(CXSourceRange range);
 
-/**
-  * \brief Determine if the source location occurs within the main file
-  * of the translation unit (as opposed to an included header).
-  */
-CINDEX_LINKAGE unsigned clang_isFromMainFile(CXSourceLocation loc);
-
 /**
  * @}
  */
diff --git a/clang/tools/libclang/CIndex.cpp b/clang/tools/libclang/CIndex.cpp
index a077589c8f795e502e0240dc3d6c0bea2801817d..21396ad1c536effd36cf05b069f25b92333df080 100644
--- a/clang/tools/libclang/CIndex.cpp
+++ b/clang/tools/libclang/CIndex.cpp
@@ -1479,16 +1479,6 @@ CXSourceLocation clang_getRangeEnd(CXSourceRange range) {
   return Result;
 }
 
-unsigned clang_isFromMainFile(CXSourceLocation loc) {
-  SourceLocation Loc = SourceLocation::getFromRawEncoding(loc.int_data);
-  if (!loc.ptr_data[0] || Loc.isInvalid())
-    return 0;
-
-  const SourceManager &SM =
-    *static_cast<const SourceManager*>(loc.ptr_data[0]);
-  return SM.isFromMainFile(Loc) ? 1 : 0;
-}
-
 } // end: extern "C"
 
 //===----------------------------------------------------------------------===//
diff --git a/clang/tools/libclang/libclang.darwin.exports b/clang/tools/libclang/libclang.darwin.exports
index a9f4f0777cdcbeac175dd7ef1f5378fb17077e97..3ef3b748547b9011808212c32f23f6929cfbdcc2 100644
--- a/clang/tools/libclang/libclang.darwin.exports
+++ b/clang/tools/libclang/libclang.darwin.exports
@@ -78,7 +78,6 @@ _clang_getTypeKindSpelling
 _clang_isCursorDefinition
 _clang_isDeclaration
 _clang_isExpression
-_clang_isFromMainFile
 _clang_isInvalid
 _clang_isPreprocessing
 _clang_isReference
diff --git a/clang/tools/libclang/libclang.exports b/clang/tools/libclang/libclang.exports
index b09e6ac56c85807318ffa6ac5db32bf1242ba49e..7df674037ba4cd2ec051a44614ab18a7a16ca545 100644
--- a/clang/tools/libclang/libclang.exports
+++ b/clang/tools/libclang/libclang.exports
@@ -78,7 +78,6 @@ clang_getTypeKindSpelling
 clang_isCursorDefinition
 clang_isDeclaration
 clang_isExpression
-clang_isFromMainFile
 clang_isInvalid
 clang_isPreprocessing
 clang_isReference