diff --git a/src/TestableIO.System.IO.Abstractions.TestingHelpers/MockDirectory.cs b/src/TestableIO.System.IO.Abstractions.TestingHelpers/MockDirectory.cs
index d7f0a6d34..b5376487d 100644
--- a/src/TestableIO.System.IO.Abstractions.TestingHelpers/MockDirectory.cs
+++ b/src/TestableIO.System.IO.Abstractions.TestingHelpers/MockDirectory.cs
@@ -118,8 +118,8 @@ public override IDirectoryInfo CreateTempSubdirectory(string prefix = null)
             // Perform directory name generation in a loop, just in case the randomly generated name already exists.
             do
             {
-                var randomDir = $"{prefix}{Path.GetRandomFileName()}";
-                potentialTempDirectory = Path.Combine(Path.GetTempPath(), randomDir);
+                var randomDir = $"{prefix}{FileSystem.Path.GetRandomFileName()}";
+                potentialTempDirectory = Path.Combine(FileSystem.Path.GetTempPath(), randomDir);
             } while (Exists(potentialTempDirectory));
 
             return CreateDirectoryInternal(potentialTempDirectory);
diff --git a/tests/TestableIO.System.IO.Abstractions.TestingHelpers.Tests/MockDirectoryTests.cs b/tests/TestableIO.System.IO.Abstractions.TestingHelpers.Tests/MockDirectoryTests.cs
index 343a98f26..fbd0fc41f 100644
--- a/tests/TestableIO.System.IO.Abstractions.TestingHelpers.Tests/MockDirectoryTests.cs
+++ b/tests/TestableIO.System.IO.Abstractions.TestingHelpers.Tests/MockDirectoryTests.cs
@@ -862,7 +862,7 @@ public void MockDirectory_CreateTempSubdirectory_ShouldCreateSubdirectoryInTempD
 
             // Assert
             Assert.That(fileSystem.Directory.Exists(result.FullName), Is.True);
-            Assert.That(result.FullName.Contains(Path.GetTempPath()), Is.True);
+            Assert.That(result.FullName, Does.StartWith(fileSystem.Path.GetTempPath()));
         }
 
         [Test]
@@ -877,7 +877,7 @@ public void MockDirectory_CreateTempSubdirectoryWithPrefix_ShouldCreateDirectory
             // Assert
             Assert.That(fileSystem.Directory.Exists(result.FullName), Is.True);
             Assert.That(Path.GetFileName(result.FullName).StartsWith("foo-"), Is.True);
-            Assert.That(result.FullName.Contains(Path.GetTempPath()), Is.True);
+            Assert.That(result.FullName.Contains(fileSystem.Path.GetTempPath()), Is.True);
         }
 #endif