diff --git a/transpiler/src/main/java/org/jsweet/transpiler/model/Util.java b/transpiler/src/main/java/org/jsweet/transpiler/model/Util.java
index 1118f5c5..ba83d164 100644
--- a/transpiler/src/main/java/org/jsweet/transpiler/model/Util.java
+++ b/transpiler/src/main/java/org/jsweet/transpiler/model/Util.java
@@ -3,6 +3,7 @@ package org.jsweet.transpiler.model;
 import java.util.List;
 
 import javax.lang.model.element.Element;
+import javax.lang.model.element.TypeElement;
 import javax.lang.model.type.TypeMirror;
 
 /**
@@ -12,6 +13,11 @@ import javax.lang.model.type.TypeMirror;
  */
 public interface Util {
 
+	/**
+	 * Returns true if the given type is an interface.
+	 */
+	boolean isInterface(TypeElement type);
+	
 	/**
 	 * Gets the qualified name for the given type.
 	 */
diff --git a/transpiler/src/main/java/org/jsweet/transpiler/model/support/UtilSupport.java b/transpiler/src/main/java/org/jsweet/transpiler/model/support/UtilSupport.java
index ea22c775..dd91ed87 100644
--- a/transpiler/src/main/java/org/jsweet/transpiler/model/support/UtilSupport.java
+++ b/transpiler/src/main/java/org/jsweet/transpiler/model/support/UtilSupport.java
@@ -29,6 +29,7 @@ import javax.lang.model.type.TypeMirror;
 import org.jsweet.transpiler.JSweetContext;
 import org.jsweet.transpiler.model.Util;
 
+import com.sun.tools.javac.code.Symbol.TypeSymbol;
 import com.sun.tools.javac.code.Type;
 import com.sun.tools.javac.code.Type.CapturedType;
 import com.sun.tools.javac.tree.JCTree;
@@ -181,7 +182,7 @@ public class UtilSupport implements Util {
 	public String getRelativePath(String fromPath, String toPath) {
 		return org.jsweet.transpiler.util.Util.getRelativePath(fromPath, toPath);
 	}
-	
+
 	@Override
 	public String getTypeInitialValue(TypeMirror type) {
 		if (type == null) {
@@ -197,6 +198,13 @@ public class UtilSupport implements Util {
 			return "null";
 		}
 	}
-	
+
+	@Override
+	public boolean isInterface(TypeElement type) {
+		if (type instanceof TypeSymbol) {
+			return context.isInterface((TypeSymbol) type);
+		}
+		return false;
+	}
 
 }