diff --git a/include/llvm/Support/PathV1.h b/include/llvm/Support/PathV1.h
index ceb6e29faf0..916edaadf75 100644
--- a/include/llvm/Support/PathV1.h
+++ b/include/llvm/Support/PathV1.h
@@ -219,14 +219,6 @@ namespace sys {
     /// @name Disk Accessors
     /// @{
     public:
-      /// This function retrieves the first \p len bytes of the file associated
-      /// with \p this. These bytes are returned as the "magic number" in the
-      /// \p Magic parameter.
-      /// @returns true if the Path is a file and the magic number is retrieved,
-      /// false otherwise.
-      /// @brief Get the file's magic number.
-      bool getMagicNumber(std::string& Magic, unsigned len) const;
-
       /// This function determines if the path name in the object references an
       /// archive file by looking at its magic number.
       /// @returns true if the file starts with the magic number for an archive
diff --git a/lib/Support/Unix/Path.inc b/lib/Support/Unix/Path.inc
index ecdc2abe3a8..57f02be1094 100644
--- a/lib/Support/Unix/Path.inc
+++ b/lib/Support/Unix/Path.inc
@@ -303,20 +303,6 @@ Path Path::GetMainExecutable(const char *argv0, void *MainAddr) {
   return Path();
 }
 
-bool Path::getMagicNumber(std::string &Magic, unsigned len) const {
-  assert(len < 1024 && "Request for magic string too long");
-  char Buf[1025];
-  int fd = ::open(path.c_str(), O_RDONLY);
-  if (fd < 0)
-    return false;
-  ssize_t bytes_read = ::read(fd, Buf, len);
-  ::close(fd);
-  if (ssize_t(len) != bytes_read)
-    return false;
-  Magic.assign(Buf, len);
-  return true;
-}
-
 bool
 Path::exists() const {
   return 0 == access(path.c_str(), F_OK );
diff --git a/lib/Support/Windows/Path.inc b/lib/Support/Windows/Path.inc
index 165c18f0a53..4a6e56350b4 100644
--- a/lib/Support/Windows/Path.inc
+++ b/lib/Support/Windows/Path.inc
@@ -590,31 +590,6 @@ Path::eraseFromDisk(bool remove_contents, std::string *ErrStr) const {
   }
 }
 
-bool Path::getMagicNumber(std::string& Magic, unsigned len) const {
-  assert(len < 1024 && "Request for magic string too long");
-  char* buf = reinterpret_cast<char*>(alloca(len));
-
-  HANDLE h = CreateFile(path.c_str(),
-                        GENERIC_READ,
-                        FILE_SHARE_READ,
-                        NULL,
-                        OPEN_EXISTING,
-                        FILE_ATTRIBUTE_NORMAL,
-                        NULL);
-  if (h == INVALID_HANDLE_VALUE)
-    return false;
-
-  DWORD nRead = 0;
-  BOOL ret = ReadFile(h, buf, len, &nRead, NULL);
-  CloseHandle(h);
-
-  if (!ret || nRead != len)
-    return false;
-
-  Magic = std::string(buf, len);
-  return true;
-}
-
 bool
 Path::renamePathOnDisk(const Path& newName, std::string* ErrMsg) {
   if (!MoveFileEx(path.c_str(), newName.c_str(), MOVEFILE_REPLACE_EXISTING))