diff --git a/antlr4-testgen-maven-plugin/resources/org/antlr4/runtime/test/templates/ParserExec/ReferenceToATN.stg b/antlr4-testgen-maven-plugin/resources/org/antlr4/runtime/test/templates/ParserExec/ReferenceToATN.stg
index 02b348a81..ce8b400ee 100644
--- a/antlr4-testgen-maven-plugin/resources/org/antlr4/runtime/test/templates/ParserExec/ReferenceToATN.stg
+++ b/antlr4-testgen-maven-plugin/resources/org/antlr4/runtime/test/templates/ParserExec/ReferenceToATN.stg
@@ -18,8 +18,8 @@ Rule() ::= "a"
 
 grammar(grammarName) ::= <<
 grammar <grammarName>;
-a : (ID|ATN_)* ATN_? {<writeln("$text")>} ;
+a : (ID|ATN)* ATN? {<writeln("$text")>} ;
 ID : 'a'..'z'+ ;
-ATN_ : '0'..'9'+;
+ATN : '0'..'9'+;
 WS : (' '|'\n') -> skip ;
 >>