diff --git a/llvm/include/llvm/Support/GlobPattern.h b/llvm/include/llvm/Support/GlobPattern.h
index 62ed4a0f23fd9..5849ca5c6bc98 100644
--- a/llvm/include/llvm/Support/GlobPattern.h
+++ b/llvm/include/llvm/Support/GlobPattern.h
@@ -71,7 +71,7 @@ class GlobPattern {
   }
 
 private:
-  StringRef Prefix;
+  std::string Prefix;
 
   struct SubGlobPattern {
     /// \param Pat the pattern to match against