diff --git a/jdk-headers/src/java/util/AbstractCollection.kt b/jdk-headers/src/java/util/AbstractCollection.kt
index d95adaeaed9..8c84b380549 100644
--- a/jdk-headers/src/java/util/AbstractCollection.kt
+++ b/jdk-headers/src/java/util/AbstractCollection.kt
@@ -1,5 +1,5 @@
 package java.util
-abstract public open class AbstractCollection<erased E> protected () : java.util.Collection<E>, java.lang.Object {
+abstract public open class AbstractCollection<erased E> protected () : java.util.Collection<E> {
     abstract override public fun iterator() : java.util.Iterator<E>
     abstract override public fun size() : Int
     override public fun isEmpty() : Boolean {}
diff --git a/jdk-headers/src/java/util/AbstractMap.kt b/jdk-headers/src/java/util/AbstractMap.kt
index a235b545570..5ff3e33ce63 100644
--- a/jdk-headers/src/java/util/AbstractMap.kt
+++ b/jdk-headers/src/java/util/AbstractMap.kt
@@ -1,6 +1,6 @@
 package java.util
 
-abstract public open class AbstractMap<erased K, erased V> protected () : java.util.Map<K, V>, java.lang.Object {
+abstract public open class AbstractMap<erased K, erased V> protected () : java.util.Map<K, V> {
     override public fun size() : Int {}
     override public fun isEmpty() : Boolean {}
     override public fun containsValue(value : Any?) : Boolean {}
diff --git a/jdk-headers/src/java/util/AbstractSequentialList.kt b/jdk-headers/src/java/util/AbstractSequentialList.kt
index 2318cc39c2e..719c111662b 100644
--- a/jdk-headers/src/java/util/AbstractSequentialList.kt
+++ b/jdk-headers/src/java/util/AbstractSequentialList.kt
@@ -1,5 +1,5 @@
 package java.util
-abstract public open class AbstractSequentialList<erased E> protected () : java.util.AbstractList<E>(), java.lang.Object {
+abstract public open class AbstractSequentialList<erased E> protected () : java.util.AbstractList<E>() {
     override public fun get(index : Int) : E {}
     override public fun set(index : Int, element : E) : E {}
     override public fun add(index : Int, element : E) : Unit {}
diff --git a/jdk-headers/src/java/util/AbstractSet.kt b/jdk-headers/src/java/util/AbstractSet.kt
index bf6e6b83259..b2dbe4f5363 100644
--- a/jdk-headers/src/java/util/AbstractSet.kt
+++ b/jdk-headers/src/java/util/AbstractSet.kt
@@ -1,5 +1,5 @@
 package java.util
-abstract public open class AbstractSet<erased E> protected () : java.util.AbstractCollection<E>(), java.util.Set<E>, java.lang.Object {
+abstract public open class AbstractSet<erased E> protected () : java.util.AbstractCollection<E>(), java.util.Set<E> {
 //    override public fun equals(o : Any?) : Boolean
 //    override public fun hashCode() : Int
     override public fun removeAll(c : java.util.Collection<*>) : Boolean {}
diff --git a/jdk-headers/src/java/util/HashMap.kt b/jdk-headers/src/java/util/HashMap.kt
index 97ee82d5368..6f3d982cf6d 100644
--- a/jdk-headers/src/java/util/HashMap.kt
+++ b/jdk-headers/src/java/util/HashMap.kt
@@ -3,8 +3,7 @@ import java.io.*
 public open class HashMap<erased K, erased V>(m : java.util.Map<out K, out V>) : java.util.AbstractMap<K, V>(),
                                                                                  java.util.Map<K, V>,
                                                                                  java.lang.Cloneable,
-                                                                                 java.io.Serializable,
-                                                                                 java.lang.Object {
+                                                                                 java.io.Serializable {
     public this() {}
     public this(initialCapacity : Int) {}
     public this(initialCapacity : Int, loadFactor : Float) {}
diff --git a/jdk-headers/src/java/util/HashSet.kt b/jdk-headers/src/java/util/HashSet.kt
index 0017654f512..4dfa28077e9 100644
--- a/jdk-headers/src/java/util/HashSet.kt
+++ b/jdk-headers/src/java/util/HashSet.kt
@@ -2,8 +2,7 @@ package java.util
 public open class HashSet<erased E>(c : java.util.Collection<out E>) : java.util.AbstractSet<E>(),
                                                                        java.util.Set<E>,
                                                                        java.lang.Cloneable,
-                                                                       java.io.Serializable,
-                                                                       java.lang.Object {
+                                                                       java.io.Serializable {
     public this() {}
     public this(initialCapacity : Int) {}
     public this(initialCapacity : Int, loadFactor : Float) {}
diff --git a/jdk-headers/src/java/util/LinkedHashMap.kt b/jdk-headers/src/java/util/LinkedHashMap.kt
index e81d937d453..6266b261d1f 100644
--- a/jdk-headers/src/java/util/LinkedHashMap.kt
+++ b/jdk-headers/src/java/util/LinkedHashMap.kt
@@ -1,6 +1,6 @@
 package java.util
-import java.io.*
-public open class LinkedHashMap<erased K, erased V>(m : java.util.Map<out K, out V>) : java.util.HashMap<K, V>(), java.util.Map<K, V>, java.lang.Object {
+
+public open class LinkedHashMap<erased K, erased V>(m : java.util.Map<out K, out V>) : java.util.HashMap<K, V>(), java.util.Map<K, V> {
     public this(initialCapacity : Int, loadFactor : Float) {}
     public this(initialCapacity : Int) {}
     public this() {}
diff --git a/jdk-headers/src/java/util/LinkedHashSet.kt b/jdk-headers/src/java/util/LinkedHashSet.kt
index 4f85a4bdb0f..51a1cca5bb1 100644
--- a/jdk-headers/src/java/util/LinkedHashSet.kt
+++ b/jdk-headers/src/java/util/LinkedHashSet.kt
@@ -2,8 +2,7 @@ package java.util
 public open class LinkedHashSet<erased E>(c : java.util.Collection<out E>) : java.util.HashSet<E>(c),
                                                                              java.util.Set<E>,
                                                                              java.lang.Cloneable,
-                                                                             java.io.Serializable,
-                                                                             java.lang.Object {
+                                                                             java.io.Serializable {
     public this(initialCapacity : Int, loadFactor : Float) {}
     public this(initialCapacity : Int) {}
     public this() {}
diff --git a/jdk-headers/src/java/util/LinkedList.kt b/jdk-headers/src/java/util/LinkedList.kt
index a4a0c4f83da..18ae65b8eb8 100644
--- a/jdk-headers/src/java/util/LinkedList.kt
+++ b/jdk-headers/src/java/util/LinkedList.kt
@@ -3,8 +3,7 @@ public open class LinkedList<erased E>(c : java.util.Collection<out E>) : java.u
                                     java.util.List<E>,
                                     java.util.Deque<E>,
                                     java.lang.Cloneable,
-                                    java.io.Serializable,
-                                    java.lang.Object {
+                                    java.io.Serializable {
     public this() {}
 
     override public fun getFirst() : E {}