diff --git a/src/Maths/Silk.NET.Maths.Tests/CubeTests.cs b/src/Maths/Silk.NET.Maths.Tests/CubeTests.cs
new file mode 100644
index 0000000000..7f10975c4a
--- /dev/null
+++ b/src/Maths/Silk.NET.Maths.Tests/CubeTests.cs
@@ -0,0 +1,56 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+using Xunit;
+
+namespace Silk.NET.Maths.Tests
+{
+    public class CubeTests
+    {
+        [Fact]
+        public void ContainsCubeTest()
+        {
+            var parent = new Cube<float>(Vector3D<float>.Zero, new Vector3D<float>(10.0f, 10.0f, 10.0f));
+
+            // Completely inside
+            var inside = new Cube<float>(new Vector3D<float>(1.0f, 1.0f, 1.0f), new Vector3D<float>(5.0f, 5.0f, 5.0f));
+            Assert.True(parent.Contains(inside));
+
+            // Identical (touching boundaries)
+            Assert.True(parent.Contains(parent));
+
+            // Exceeds max X
+            var exceedsX = new Cube<float>(new Vector3D<float>(1.0f, 1.0f, 1.0f), new Vector3D<float>(11.0f, 5.0f, 5.0f));
+            Assert.False(parent.Contains(exceedsX));
+
+            // Exceeds max Y
+            var exceedsY = new Cube<float>(new Vector3D<float>(1.0f, 1.0f, 1.0f), new Vector3D<float>(5.0f, 11.0f, 5.0f));
+            Assert.False(parent.Contains(exceedsY));
+
+            // Exceeds max Z
+            var exceedsZ = new Cube<float>(new Vector3D<float>(1.0f, 1.0f, 1.0f), new Vector3D<float>(5.0f, 5.0f, 11.0f));
+            Assert.False(parent.Contains(exceedsZ));
+
+            // Origin outside min Z
+            var outsideMinZ = new Cube<float>(new Vector3D<float>(1.0f, 1.0f, -1.0f), new Vector3D<float>(5.0f, 5.0f, 5.0f));
+            Assert.False(parent.Contains(outsideMinZ));
+        }
+
+        [Fact]
+        public void ContainsPointTest()
+        {
+            var cube = new Cube<float>(Vector3D<float>.Zero, new Vector3D<float>(10.0f, 10.0f, 10.0f));
+
+            Assert.True(cube.Contains(new Vector3D<float>(5.0f, 5.0f, 5.0f)));
+            Assert.True(cube.Contains(Vector3D<float>.Zero));
+            Assert.True(cube.Contains(new Vector3D<float>(10.0f, 10.0f, 10.0f)));
+
+            Assert.False(cube.Contains(new Vector3D<float>(-1.0f, 5.0f, 5.0f)));
+            Assert.False(cube.Contains(new Vector3D<float>(5.0f, -1.0f, 5.0f)));
+            Assert.False(cube.Contains(new Vector3D<float>(5.0f, 5.0f, -1.0f)));
+            Assert.False(cube.Contains(new Vector3D<float>(11.0f, 5.0f, 5.0f)));
+            Assert.False(cube.Contains(new Vector3D<float>(5.0f, 11.0f, 5.0f)));
+            Assert.False(cube.Contains(new Vector3D<float>(5.0f, 5.0f, 11.0f)));
+        }
+    }
+}
diff --git a/src/Maths/Silk.NET.Maths/Cube.cs b/src/Maths/Silk.NET.Maths/Cube.cs
index f527716518..ba90199886 100644
--- a/src/Maths/Silk.NET.Maths/Cube.cs
+++ b/src/Maths/Silk.NET.Maths/Cube.cs
@@ -121,7 +121,7 @@ public bool Contains(Cube<T> other)
             return Scalar.GreaterThanOrEqual(other.Origin.X, this.Origin.X) && Scalar.GreaterThanOrEqual
                 (other.Origin.Y, this.Origin.Y) && Scalar.GreaterThanOrEqual
                 (other.Origin.Z, this.Origin.Z) && Scalar.LessThanOrEqual(oMax.X, tMax.X) && Scalar.LessThanOrEqual
-                (oMax.Y, tMax.Y) && Scalar.LessThanOrEqual(oMax.Y, tMax.Y);
+                (oMax.Y, tMax.Y) && Scalar.LessThanOrEqual(oMax.Z, tMax.Z);
         }
 
         /// <summary>