diff --git a/tool/resources/org/antlr/v4/tool/templates/codegen/Swift/Swift.stg b/tool/resources/org/antlr/v4/tool/templates/codegen/Swift/Swift.stg
index a70d6f2d9..a33166f43 100755
--- a/tool/resources/org/antlr/v4/tool/templates/codegen/Swift/Swift.stg
+++ b/tool/resources/org/antlr/v4/tool/templates/codegen/Swift/Swift.stg
@@ -395,7 +395,7 @@ RuleFunction(currentRule,args,code,locals,ruleCtx,altLabelCtxs,namedActions,fina
 <altLabelCtxs:{l | <altLabelCtxs.(l)>}; separator="\n">
 @discardableResult
 <if(currentRule.modifiers)><currentRule.modifiers:{f | <f> }><else> <accessLevelOpenOK(parser)> func <endif><currentRule.name>(<if(first(args))>_ <endif><args; separator=", _">) throws -> <currentRule.ctxType> {
-	var _localctx: <currentRule.ctxType> = <currentRule.ctxType>(_ctx, getState()<currentRule.args:{a | , <a.name>}>)
+	let _localctx: <currentRule.ctxType> = <currentRule.ctxType>(_ctx, getState()<currentRule.args:{a | , <a.name>}>)
 	try enterRule(_localctx, <currentRule.startState>, <parser.name>.RULE_<currentRule.name>)
 	<namedActions.init>
 	<locals; separator="\n">
@@ -438,9 +438,9 @@ LeftRecursiveRuleFunction(currentRule,args,code,locals,ruleCtx,altLabelCtxs,
 @discardableResult
 private func <currentRule.name>(_ _p<args:{a | , <a>}>: Int) throws -> <currentRule.ctxType>   {
 	let _parentctx: ParserRuleContext? = _ctx
-	var _parentState: Int = getState()
+	let _parentState: Int = getState()
 	var _localctx: <currentRule.ctxType> = <currentRule.ctxType>(_ctx, _parentState<currentRule.args:{a | , <a.name>}>)
-	var  _prevctx: <currentRule.ctxType> = _localctx
+	let  _prevctx: <currentRule.ctxType> = _localctx
 	var _startState: Int = <currentRule.startState>
 	try enterRecursionRule(_localctx, <currentRule.startState>, <parser.name>.RULE_<currentRule.name>, _p)
 	<namedActions.init>