diff --git a/UnitsNet.Tests/CustomCode/VolumeTests.cs b/UnitsNet.Tests/CustomCode/VolumeTests.cs
index 17cb52f922..44d7e4e3e4 100644
--- a/UnitsNet.Tests/CustomCode/VolumeTests.cs
+++ b/UnitsNet.Tests/CustomCode/VolumeTests.cs
@@ -151,8 +151,8 @@ public void VolumeDividedByDurationEqualsVolumeFlow()
         [Fact]
         public void VolumeDividedByVolumeFlowEqualsTimeSpan()
         {
-            TimeSpan timeSpan = Volume.FromCubicMeters(20) / VolumeFlow.FromCubicMetersPerSecond(2);
-            Assert.Equal(TimeSpan.FromSeconds(10), timeSpan);
+            Duration duration = Volume.FromCubicMeters(20) / VolumeFlow.FromCubicMetersPerSecond(2);
+            Assert.Equal(Duration.FromSeconds(10), duration);
         }
     }
 }
diff --git a/UnitsNet/CustomCode/Quantities/Volume.extra.cs b/UnitsNet/CustomCode/Quantities/Volume.extra.cs
deleted file mode 100644
index 88d6bf2a51..0000000000
--- a/UnitsNet/CustomCode/Quantities/Volume.extra.cs
+++ /dev/null
@@ -1,16 +0,0 @@
-// Licensed under MIT No Attribution, see LICENSE file at the root.
-// Copyright 2013 Andreas Gullberg Larsen (andreas.larsen84@gmail.com). Maintained at https://github.com/angularsen/UnitsNet.
-
-using System;
-
-namespace UnitsNet
-{
-    public partial struct Volume
-    {
-        /// <summary>Get <see cref="TimeSpan"/> from <see cref="Volume"/> divided by <see cref="VolumeFlow"/>.</summary>
-        public static TimeSpan operator /(Volume volume, VolumeFlow volumeFlow)
-        {
-            return TimeSpan.FromSeconds(volume.CubicMeters / volumeFlow.CubicMetersPerSecond);
-        }
-    }
-}