diff --git a/jlox/tlox/src/main/java/xyz/ctsk/lox/LoxLanguage.java b/jlox/tlox/src/main/java/xyz/ctsk/lox/LoxLanguage.java
index a25f388..467ba98 100644
--- a/jlox/tlox/src/main/java/xyz/ctsk/lox/LoxLanguage.java
+++ b/jlox/tlox/src/main/java/xyz/ctsk/lox/LoxLanguage.java
@@ -2,6 +2,7 @@ package xyz.ctsk.lox;
 
 import com.oracle.truffle.api.CallTarget;
 import com.oracle.truffle.api.TruffleLanguage;
+import com.oracle.truffle.api.strings.TruffleString;
 import xyz.ctsk.lox.nodes.LoxExpressionNode;
 import xyz.ctsk.lox.nodes.LoxNode;
 import xyz.ctsk.lox.nodes.LoxRootNode;
@@ -11,6 +12,7 @@ import xyz.ctsk.lox.parser.LoxParser;
 public class LoxLanguage extends TruffleLanguage<Void> {
     public static final String ID = "lox";
     public static final String NAME = "Lox";
+    public static final TruffleString.Encoding STRING_ENCODING = TruffleString.Encoding.UTF_16;
 
     @Override
     protected CallTarget parse(ParsingRequest request) throws Exception {
diff --git a/jlox/tlox/src/main/java/xyz/ctsk/lox/nodes/expr/LoxAddNode.java b/jlox/tlox/src/main/java/xyz/ctsk/lox/nodes/expr/LoxAddNode.java
index 9091720..9504c70 100644
--- a/jlox/tlox/src/main/java/xyz/ctsk/lox/nodes/expr/LoxAddNode.java
+++ b/jlox/tlox/src/main/java/xyz/ctsk/lox/nodes/expr/LoxAddNode.java
@@ -1,8 +1,10 @@
 package xyz.ctsk.lox.nodes.expr;
 
+import com.oracle.truffle.api.dsl.Cached;
 import com.oracle.truffle.api.dsl.Fallback;
 import com.oracle.truffle.api.dsl.Specialization;
 import com.oracle.truffle.api.strings.TruffleString;
+import xyz.ctsk.lox.LoxLanguage;
 import xyz.ctsk.lox.runtime.LoxException;
 import xyz.ctsk.lox.nodes.LoxBinaryNode;
 
@@ -13,8 +15,8 @@ public abstract class LoxAddNode extends LoxBinaryNode {
     }
 
     @Specialization
-    public TruffleString add(TruffleString left, TruffleString right) {
-        return TruffleString.ConcatNode.create().execute(left, right, TruffleString.Encoding.UTF_16, false);
+    public TruffleString add(TruffleString left, TruffleString right, @Cached TruffleString.ConcatNode concatNode) {
+        return concatNode.execute(left, right, LoxLanguage.STRING_ENCODING, true);
     }
 
     @Fallback