diff --git a/Duplicati/UnitTest/DiskImage/DiskImageUnitTests.cs b/Duplicati/UnitTest/DiskImage/DiskImageUnitTests.cs
index f15699caf..c975d56e9 100644
--- a/Duplicati/UnitTest/DiskImage/DiskImageUnitTests.cs
+++ b/Duplicati/UnitTest/DiskImage/DiskImageUnitTests.cs
@@ -3769,7 +3769,7 @@ public class DiskImageUnitTests : BasicSetupHelper
 
         // Test with geometry file at the root of the device
         // Use the actual device path from the GPT test disk
-        var geometryPath = $"{s_gptRawDisk!.DevicePath}/geometry.json";
+        var geometryPath = $"{s_gptRawDisk!.DevicePath}{Path.DirectorySeparatorChar}geometry.json";
         var result = parsePathMethod!.Invoke(provider, [geometryPath]);
         Assert.IsNotNull(result, "Should return a tuple.");
 
diff --git a/proprietary/DiskImage/RestoreProvider.cs b/proprietary/DiskImage/RestoreProvider.cs
index 9543b032a..3cae0726b 100644
--- a/proprietary/DiskImage/RestoreProvider.cs
+++ b/proprietary/DiskImage/RestoreProvider.cs
@@ -588,7 +588,7 @@ public sealed class RestoreProvider : IRestoreDestinationProviderModule, IDispos
 
         string geometryDevicePath = NormalizePath(_targetDisk.DevicePath);
 
-        string expectedGeometryPath = $"{geometryDevicePath}/geometry.json";
+        string expectedGeometryPath = $"{geometryDevicePath}{Path.DirectorySeparatorChar}geometry.json";
 
         return string.Equals(path, expectedGeometryPath, StringComparison.OrdinalIgnoreCase);
     }