diff --git a/lib/Support/PathV2.cpp b/lib/Support/PathV2.cpp
index 3ef13e253f0..bf8672bc57b 100644
--- a/lib/Support/PathV2.cpp
+++ b/lib/Support/PathV2.cpp
@@ -346,7 +346,7 @@ const StringRef root_directory(StringRef path) {
 
 const StringRef relative_path(StringRef path) {
   StringRef root = root_path(path);
-  return root.substr(root.size());
+  return path.substr(root.size());
 }
 
 void append(SmallVectorImpl<char> &path, const Twine &a,