diff --git a/mlir/lib/Tools/PDLL/Parser/Parser.cpp b/mlir/lib/Tools/PDLL/Parser/Parser.cpp
index 51e702a1bb53a..c883baa7be2c5 100644
--- a/mlir/lib/Tools/PDLL/Parser/Parser.cpp
+++ b/mlir/lib/Tools/PDLL/Parser/Parser.cpp
@@ -147,8 +147,9 @@ class Parser {
     std::string docStr;
     {
       llvm::raw_string_ostream docOS(docStr);
+      std::string tmpDocStr = doc.str();
       raw_indented_ostream(docOS).printReindented(
-          StringRef(docStr).rtrim(" \t"));
+          StringRef(tmpDocStr).rtrim(" \t"));
     }
     return docStr;
   }