diff --git a/src/Promote.NuGet.Commands/Core/DistinctQueue.cs b/src/Promote.NuGet.Commands/Core/DistinctQueue.cs
index 0255c50..df909ea 100644
--- a/src/Promote.NuGet.Commands/Core/DistinctQueue.cs
+++ b/src/Promote.NuGet.Commands/Core/DistinctQueue.cs
@@ -15,12 +15,14 @@ public DistinctQueue()
         _enqueuedItems = new HashSet<T>();
     }
 
-    public DistinctQueue(IEnumerable<T> items)
+    public DistinctQueue(IEnumerable<T> items) : this()
     {
         if (items == null) throw new ArgumentNullException(nameof(items));
 
-        _queue = new Queue<T>(items);
-        _enqueuedItems = new HashSet<T>();
+        foreach (var item in items)
+        {
+            Enqueue(item);
+        }
     }
 
     public bool Enqueue(T item)
diff --git a/tests/Promote.NuGet.Commands.Tests/Core/DistinctQueueTests.cs b/tests/Promote.NuGet.Commands.Tests/Core/DistinctQueueTests.cs
index f23f3f8..9fdac35 100644
--- a/tests/Promote.NuGet.Commands.Tests/Core/DistinctQueueTests.cs
+++ b/tests/Promote.NuGet.Commands.Tests/Core/DistinctQueueTests.cs
@@ -95,4 +95,37 @@ public void Create_queue_with_items()
         queue.TryDequeue(out result).Should().BeFalse();
         result.Should().BeNull();
     }
+
+    [Test]
+    public void Ctor_keeps_only_unique_initial_items()
+    {
+        var queue = new DistinctQueue<string>(new[] { "str_1", "str_2", "str_1" });
+
+        queue.TryDequeue(out var result).Should().BeTrue();
+        result.Should().Be("str_1");
+
+        queue.TryDequeue(out result).Should().BeTrue();
+        result.Should().Be("str_2");
+
+        queue.TryDequeue(out result).Should().BeFalse();
+        result.Should().BeNull();
+    }
+
+    [Test]
+    public void Cannot_enqueue_items_added_by_ctor()
+    {
+        var queue = new DistinctQueue<string>(new[] { "str_1", "str_2" });
+
+        queue.TryDequeue(out var result).Should().BeTrue();
+        result.Should().Be("str_1");
+
+        queue.Enqueue("str_1").Should().BeFalse();
+        queue.Enqueue("str_2").Should().BeFalse();
+
+        queue.TryDequeue(out result).Should().BeTrue();
+        result.Should().Be("str_2");
+
+        queue.TryDequeue(out result).Should().BeFalse();
+        result.Should().BeNull();
+    }
 }
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