diff --git a/src/mycompiler/mytype/RefType.java b/src/mycompiler/mytype/RefType.java
index cfa3b006..9e1ec0c2 100755
--- a/src/mycompiler/mytype/RefType.java
+++ b/src/mycompiler/mytype/RefType.java
@@ -8,6 +8,7 @@ import java.util.Hashtable;
 import java.util.Iterator;
 import java.util.Vector;
 
+import mycompiler.IItemWithOffset;
 import mycompiler.mybytecode.JVMCode;
 import mycompiler.myclass.UsedId;
 import mycompiler.myexception.SCException;
@@ -21,10 +22,13 @@ import org.apache.log4j.Logger;
 
 
 
+
 import sun.reflect.generics.reflectiveObjects.NotImplementedException;
 import typinferenz.JavaCodeResult;
 import typinferenz.ResultSet;
 import typinferenz.TypeInsertable;
+import typinferenz.assumptions.TypeAssumptions;
+import typinferenz.exceptions.TypeinferenceException;
 
 
 
@@ -780,6 +784,18 @@ public class RefType extends Type implements IMatchable
 		}
 		return ret;
     }
+	
+	@Override
+	public Type checkType(TypeAssumptions ass, IItemWithOffset parent){
+		//Der RefType muss zusätzlich seine Parameter prüfen.
+		Vector<Type> parameterList = new Vector<>();
+		if(this.parameter!=null)for(Type param : this.parameter){
+			parameterList.add(param.checkType(ass, parent));
+		}
+		this.parameter = parameterList;
+		Type t = super.checkType(ass,parent);
+		return t;
+	}
     
 }
 // ino.end