diff --git a/src/main/java/abstractSyntaxTree/Expression/IExpression.java b/src/main/java/abstractSyntaxTree/Expression/IExpression.java
index 24c4ac1..2379268 100644
--- a/src/main/java/abstractSyntaxTree/Expression/IExpression.java
+++ b/src/main/java/abstractSyntaxTree/Expression/IExpression.java
@@ -1,13 +1,14 @@
 package abstractSyntaxTree.Expression;
 
 import TypeCheck.TypeCheckResult;
+import abstractSyntaxTree.Node;
 import abstractSyntaxTree.Parameter.ParameterList;
 import org.objectweb.asm.MethodVisitor;
 
 import java.util.HashMap;
 import java.util.LinkedHashMap;
 
-public interface IExpression {
+public interface IExpression extends Node {
     // typeCheck method
     //TypeCheckResult typeCheck() throws Exception;
     TypeCheckResult typeCheck(HashMap<String, HashMap<String, HashMap<String, ParameterList>>> methodContext, HashMap<String, HashMap<String, String>> typeContext, HashMap<String, String> localVars) throws Exception;