diff --git a/lists/arraylist/arraylist_test.go b/lists/arraylist/arraylist_test.go
index 9de67da..b4e131b 100644
--- a/lists/arraylist/arraylist_test.go
+++ b/lists/arraylist/arraylist_test.go
@@ -379,6 +379,20 @@ func TestListIteratorPrev(t *testing.T) {
 	}
 }
 
+func TestListIteratorReset(t *testing.T) {
+	list := New()
+	it := list.Iterator()
+	it.Reset()
+	list.Add("a", "b", "c")
+	for it.Next() {
+	}
+	it.Reset()
+	it.Next()
+	if index, value := it.Index(), it.Value(); index != 0 || value != "a" {
+		t.Errorf("Got %v,%v expected %v,%v", index, value, 0, "a")
+	}
+}
+
 func BenchmarkList(b *testing.B) {
 	for i := 0; i < b.N; i++ {
 		list := New()
diff --git a/lists/doublylinkedlist/doublylinkedlist_test.go b/lists/doublylinkedlist/doublylinkedlist_test.go
index 1ff73b6..e24f376 100644
--- a/lists/doublylinkedlist/doublylinkedlist_test.go
+++ b/lists/doublylinkedlist/doublylinkedlist_test.go
@@ -379,6 +379,20 @@ func TestListIteratorPrev(t *testing.T) {
 	}
 }
 
+func TestListIteratorReset(t *testing.T) {
+	list := New()
+	it := list.Iterator()
+	it.Reset()
+	list.Add("a", "b", "c")
+	for it.Next() {
+	}
+	it.Reset()
+	it.Next()
+	if index, value := it.Index(), it.Value(); index != 0 || value != "a" {
+		t.Errorf("Got %v,%v expected %v,%v", index, value, 0, "a")
+	}
+}
+
 func BenchmarkList(b *testing.B) {
 	for i := 0; i < b.N; i++ {
 		list := New()
diff --git a/lists/singlylinkedlist/singlylinkedlist_test.go b/lists/singlylinkedlist/singlylinkedlist_test.go
index 53c2ad8..6c0241d 100644
--- a/lists/singlylinkedlist/singlylinkedlist_test.go
+++ b/lists/singlylinkedlist/singlylinkedlist_test.go
@@ -338,6 +338,20 @@ func TestListIteratorNext(t *testing.T) {
 	}
 }
 
+func TestListIteratorReset(t *testing.T) {
+	list := New()
+	it := list.Iterator()
+	it.Reset()
+	list.Add("a", "b", "c")
+	for it.Next() {
+	}
+	it.Reset()
+	it.Next()
+	if index, value := it.Index(), it.Value(); index != 0 || value != "a" {
+		t.Errorf("Got %v,%v expected %v,%v", index, value, 0, "a")
+	}
+}
+
 func BenchmarkList(b *testing.B) {
 	for i := 0; i < b.N; i++ {
 		list := New()
diff --git a/maps/treemap/treemap_test.go b/maps/treemap/treemap_test.go
index ac4d778..228472c 100644
--- a/maps/treemap/treemap_test.go
+++ b/maps/treemap/treemap_test.go
@@ -406,6 +406,22 @@ func TestMapIteratorPrev(t *testing.T) {
 	}
 }
 
+func TestListIteratorReset(t *testing.T) {
+	m := NewWithIntComparator()
+	it := m.Iterator()
+	it.Reset()
+	m.Put(3, "c")
+	m.Put(1, "a")
+	m.Put(2, "b")
+	for it.Next() {
+	}
+	it.Reset()
+	it.Next()
+	if key, value := it.Key(), it.Value(); key != 1 || value != "a" {
+		t.Errorf("Got %v,%v expected %v,%v", key, value, 1, "a")
+	}
+}
+
 func BenchmarkMap(b *testing.B) {
 	for i := 0; i < b.N; i++ {
 		m := NewWithIntComparator()
diff --git a/sets/treeset/treeset.go b/sets/treeset/treeset.go
index 9a590ff..43a1717 100644
--- a/sets/treeset/treeset.go
+++ b/sets/treeset/treeset.go
@@ -154,6 +154,7 @@ func (iterator *Iterator) Index() int {
 // Reset sets the iterator to the initial state.
 // Call Next() to fetch the first element if any.
 func (iterator *Iterator) Reset() {
+	iterator.index = -1
 	iterator.iterator.Reset()
 }
 
diff --git a/sets/treeset/treeset_test.go b/sets/treeset/treeset_test.go
index ccdb16c..990cf3c 100644
--- a/sets/treeset/treeset_test.go
+++ b/sets/treeset/treeset_test.go
@@ -278,6 +278,20 @@ func TestSetIteratorPrev(t *testing.T) {
 	}
 }
 
+func TestListIteratorReset(t *testing.T) {
+	m := NewWithStringComparator()
+	it := m.Iterator()
+	it.Reset()
+	m.Add("a", "b", "c")
+	for it.Next() {
+	}
+	it.Reset()
+	it.Next()
+	if index, value := it.Index(), it.Value(); index != 0 || value != "a" {
+		t.Errorf("Got %v,%v expected %v,%v", index, value, 0, "a")
+	}
+}
+
 func BenchmarkSet(b *testing.B) {
 	for i := 0; i < b.N; i++ {
 		set := NewWithIntComparator()
diff --git a/stacks/arraystack/arraystack_test.go b/stacks/arraystack/arraystack_test.go
index fad4ac0..89faa43 100644
--- a/stacks/arraystack/arraystack_test.go
+++ b/stacks/arraystack/arraystack_test.go
@@ -176,6 +176,22 @@ func TestStackIteratorPrev(t *testing.T) {
 	}
 }
 
+func TestListIteratorReset(t *testing.T) {
+	stack := New()
+	it := stack.Iterator()
+	it.Reset()
+	stack.Push("a")
+	stack.Push("b")
+	stack.Push("c")
+	for it.Next() {
+	}
+	it.Reset()
+	it.Next()
+	if index, value := it.Index(), it.Value(); index != 0 || value != "c" {
+		t.Errorf("Got %v,%v expected %v,%v", index, value, 0, "c")
+	}
+}
+
 func BenchmarkStack(b *testing.B) {
 	for i := 0; i < b.N; i++ {
 		stack := New()
diff --git a/stacks/linkedliststack/linkedliststack_test.go b/stacks/linkedliststack/linkedliststack_test.go
index 4fb0002..f9f1df0 100644
--- a/stacks/linkedliststack/linkedliststack_test.go
+++ b/stacks/linkedliststack/linkedliststack_test.go
@@ -136,6 +136,22 @@ func TestStackIterator(t *testing.T) {
 	}
 }
 
+func TestListIteratorReset(t *testing.T) {
+	stack := New()
+	it := stack.Iterator()
+	it.Reset()
+	stack.Push("a")
+	stack.Push("b")
+	stack.Push("c")
+	for it.Next() {
+	}
+	it.Reset()
+	it.Next()
+	if index, value := it.Index(), it.Value(); index != 0 || value != "c" {
+		t.Errorf("Got %v,%v expected %v,%v", index, value, 0, "c")
+	}
+}
+
 func BenchmarkStack(b *testing.B) {
 	for i := 0; i < b.N; i++ {
 		stack := New()
diff --git a/trees/binaryheap/binaryheap_test.go b/trees/binaryheap/binaryheap_test.go
index d72375a..aed82c0 100644
--- a/trees/binaryheap/binaryheap_test.go
+++ b/trees/binaryheap/binaryheap_test.go
@@ -191,6 +191,22 @@ func TestBinaryHeapIteratorPrev(t *testing.T) {
 	}
 }
 
+func TestListIteratorReset(t *testing.T) {
+	tree := NewWithIntComparator()
+	it := tree.Iterator()
+	it.Reset()
+	tree.Push(2)
+	tree.Push(3)
+	tree.Push(1)
+	for it.Next() {
+	}
+	it.Reset()
+	it.Next()
+	if index, value := it.Index(), it.Value(); index != 0 || value != 1 {
+		t.Errorf("Got %v,%v expected %v,%v", index, value, 0, 1)
+	}
+}
+
 func BenchmarkBinaryHeap(b *testing.B) {
 	for i := 0; i < b.N; i++ {
 		heap := NewWithIntComparator()
diff --git a/trees/redblacktree/redblacktree_test.go b/trees/redblacktree/redblacktree_test.go
index 3f5987a..3795859 100644
--- a/trees/redblacktree/redblacktree_test.go
+++ b/trees/redblacktree/redblacktree_test.go
@@ -496,6 +496,22 @@ func TestRedBlackTreeIterator4(t *testing.T) {
 	}
 }
 
+func TestListIteratorReset(t *testing.T) {
+	tree := NewWithIntComparator()
+	tree.Put(3, "c")
+	tree.Put(1, "a")
+	tree.Put(2, "b")
+	it := tree.Iterator()
+	it.Reset()
+	for it.Next() {
+	}
+	it.Reset()
+	it.Next()
+	if key, value := it.Key(), it.Value(); key != 1 || value != "a" {
+		t.Errorf("Got %v,%v expected %v,%v", key, value, 1, "a")
+	}
+}
+
 func BenchmarkRedBlackTree(b *testing.B) {
 	for i := 0; i < b.N; i++ {
 		tree := NewWithIntComparator()