diff --git a/tools/llvm-upgrade/UpgradeParser.y b/tools/llvm-upgrade/UpgradeParser.y
index 12ad18223be..09642661fdb 100644
--- a/tools/llvm-upgrade/UpgradeParser.y
+++ b/tools/llvm-upgrade/UpgradeParser.y
@@ -708,7 +708,7 @@ ConstVal: Types '[' ConstVector ']' { // Nonempty unsized arr
     *$$.cnst += " " + *$2;
     delete $2;
   }
-  | UIntType EUINT64VAL {            // integral constants
+  | UIntType EInt64Val {            // integral constants
     $$.type = $1;
     $$.cnst = new std::string($1->getNewTy());
     *$$.cnst += " " + *$2;