diff --git a/src/Numerics/LinearAlgebra/Double/SymmetricMatrix.cs b/src/Numerics/LinearAlgebra/Double/SymmetricMatrix.cs
index 33dea414..6bb58965 100644
--- a/src/Numerics/LinearAlgebra/Double/SymmetricMatrix.cs
+++ b/src/Numerics/LinearAlgebra/Double/SymmetricMatrix.cs
@@ -78,7 +78,7 @@
         /// </returns>
         public override sealed Matrix<double> Transpose()
         {
-            return this;
+            return this.Clone();
         }
 
         /// <summary>