diff --git a/cpplint/cpplint.py b/cpplint/cpplint.py
index 52cb7d0..73bf16a 100755
--- a/cpplint/cpplint.py
+++ b/cpplint/cpplint.py
@@ -1777,6 +1777,8 @@ def GetHeaderGuardCPPVariable(filename):
   fileinfo = FileInfo(filename)
   file_path_from_root = fileinfo.RepositoryName()
   if _root:
+    file_path_from_root = fileinfo.FullName()
+
     suffix = os.sep
     # On Windows using directory separator will leave us with
     # "bogus escape error" unless we properly escape regex.