diff --git a/src/de/dhbwstuttgart/typeinference/unify/model/PlaceholderType.java b/src/de/dhbwstuttgart/typeinference/unify/model/PlaceholderType.java
index 55da2325..aa401b8a 100644
--- a/src/de/dhbwstuttgart/typeinference/unify/model/PlaceholderType.java
+++ b/src/de/dhbwstuttgart/typeinference/unify/model/PlaceholderType.java
@@ -11,6 +11,7 @@ public final class PlaceholderType extends UnifyType{
 	
 	protected static final HashSet<String> EXISTING_PLACEHOLDERS = new HashSet<String>();
 	protected static String nextName = "gen_";
+	protected static Random rnd = new Random(43558747548978L);
 	
 	public PlaceholderType(String name) {
 		super(name);
@@ -30,7 +31,7 @@ public final class PlaceholderType extends UnifyType{
 	 * Returns random char between 'a' and 'z'
 	 */
 	private static char randomChar() {
-		return (char) (new Random().nextInt(22) + 97);
+		return (char) (rnd.nextInt(22) + 97);
 	}
 
 	@Override