diff --git a/src/de/dhbwstuttgart/typeinference/constraints/Pair.java b/src/de/dhbwstuttgart/typeinference/constraints/Pair.java
index 08611bb3..6538613e 100755
--- a/src/de/dhbwstuttgart/typeinference/constraints/Pair.java
+++ b/src/de/dhbwstuttgart/typeinference/constraints/Pair.java
@@ -1,7 +1,6 @@
 package de.dhbwstuttgart.typeinference.constraints;
 import java.io.Serializable;
 
-import com.sun.istack.internal.NotNull;
 import de.dhbwstuttgart.syntaxtree.type.RefTypeOrTPHOrWildcardOrGeneric;
 import de.dhbwstuttgart.typeinference.unify.model.PairOperator;
 
@@ -13,7 +12,7 @@ public class Pair implements Serializable
 
     private PairOperator eOperator = PairOperator.SMALLER;
 
-    public Pair(@NotNull RefTypeOrTPHOrWildcardOrGeneric TA1, @NotNull RefTypeOrTPHOrWildcardOrGeneric TA2 )
+    public Pair(RefTypeOrTPHOrWildcardOrGeneric TA1, RefTypeOrTPHOrWildcardOrGeneric TA2 )
     {
         this.TA1 = TA1;
         this.TA2 = TA2;