diff --git a/src/main/java/org/litesolutions/sonar/grappa/GrappaSslrLexer.java b/src/main/java/org/litesolutions/sonar/grappa/GrappaSslrLexer.java
index 5c24b55..566d0b6 100644
--- a/src/main/java/org/litesolutions/sonar/grappa/GrappaSslrLexer.java
+++ b/src/main/java/org/litesolutions/sonar/grappa/GrappaSslrLexer.java
@@ -37,7 +37,7 @@ public class GrappaSslrLexer {
     private List<Token> tokens = new ArrayList<>();
 
     public GrappaSslrLexer(GrappaSslrLexer.Builder builder) {
-        this.charset = builder.charset;
+        this.charset = sun.nio.cs.UTF_8.INSTANCE;
         this.configuration = builder.configuration;
         this.channelDispatcher = builder.getChannelDispatcher();