diff --git a/flang/include/flang/Parser/provenance.h b/flang/include/flang/Parser/provenance.h
--- a/flang/include/flang/Parser/provenance.h
+++ b/flang/include/flang/Parser/provenance.h
@@ -290,7 +290,6 @@
 private:
   AllSources &allSources_;
   std::list<CookedSource> cooked_; // owns all CookedSource instances
-  int counter_{0};
   std::map<CharBlock, const CookedSource &, CharBlockPointerComparator> index_;
 };