diff --git a/src/main/java/de/dhbwstuttgart/syntaxtree/factory/UnifyTypeFactory.java b/src/main/java/de/dhbwstuttgart/syntaxtree/factory/UnifyTypeFactory.java
index 326f5a77..743fbb74 100644
--- a/src/main/java/de/dhbwstuttgart/syntaxtree/factory/UnifyTypeFactory.java
+++ b/src/main/java/de/dhbwstuttgart/syntaxtree/factory/UnifyTypeFactory.java
@@ -120,7 +120,7 @@ public class UnifyTypeFactory {
     }
 
     public static UnifyType convert(TypePlaceholder tph){
-    	PlaceholderType ntph = PlaceholderType.convertTypePlaceholder(tph.getName());//eingefuegt PL 2019-01-11 //new PlaceholderType(tph.getName());
+    	PlaceholderType ntph = new PlaceholderType(tph.getName());
     	int in = PLACEHOLDERS.indexOf(ntph);
 		if (in == -1) {
 			PLACEHOLDERS.add(ntph);
diff --git a/src/main/java/de/dhbwstuttgart/typeinference/unify/model/PlaceholderType.java b/src/main/java/de/dhbwstuttgart/typeinference/unify/model/PlaceholderType.java
index 23848ae6..09402c2f 100644
--- a/src/main/java/de/dhbwstuttgart/typeinference/unify/model/PlaceholderType.java
+++ b/src/main/java/de/dhbwstuttgart/typeinference/unify/model/PlaceholderType.java
@@ -23,7 +23,7 @@ public final class PlaceholderType extends UnifyType{
 	 * Static list containing the names of all existing placeholders.
 	 * Used for generating fresh placeholders.
 	 */
-	public static final ArrayList<PlaceholderType> EXISTING_PLACEHOLDERS = new ArrayList<PlaceholderType>();
+	public static final ArrayList<String> EXISTING_PLACEHOLDERS = new ArrayList<String>();
 	
 	/**
 	 * Prefix of auto-generated placeholder names.
@@ -60,28 +60,17 @@ public final class PlaceholderType extends UnifyType{
 	 */
 	public PlaceholderType(String name) {
 		super(name, new TypeParams());
+		EXISTING_PLACEHOLDERS.add(name); // Add to list of existing placeholder names
 		IsGenerated = false; // This type is user generated
 	}
 	
-	public static PlaceholderType convertTypePlaceholder(String name) {//eingefuegt PL 2019-01-11
-		PlaceholderType newTph = new PlaceholderType(name);
-		int i = EXISTING_PLACEHOLDERS.indexOf(newTph);//equals vergleicht den Namen
-		if (i == -1) {
-			EXISTING_PLACEHOLDERS.add(newTph); // Add to list of existing placeholder names
-			return newTph;
-		}
-		else {
-			return EXISTING_PLACEHOLDERS.get(i);
-		}
-	}
-	
 	/**
 	 * Creates a new placeholdertype 
 	 * @param isGenerated true if this placeholder is auto-generated, false if it is user-generated.
 	 */
 	protected PlaceholderType(String name, boolean isGenerated) {
 		super(name, new TypeParams());
-		EXISTING_PLACEHOLDERS.add(this); // Add to list of existing placeholder names
+		EXISTING_PLACEHOLDERS.add(name); // Add to list of existing placeholder names
 		IsGenerated = isGenerated;
 	}