diff --git a/src/NzbDrone.Common.Test/PathExtensionFixture.cs b/src/NzbDrone.Common.Test/PathExtensionFixture.cs
index e3e7fb34a..ec5451029 100644
--- a/src/NzbDrone.Common.Test/PathExtensionFixture.cs
+++ b/src/NzbDrone.Common.Test/PathExtensionFixture.cs
@@ -86,7 +86,7 @@ public void paths_should_not_be_equal(string first, string second)
         {
             first.AsOsAgnostic().PathEquals(second.AsOsAgnostic()).Should().BeFalse();
         }
-        
+
         [Test]
         public void should_return_false_when_not_a_child()
         {
@@ -113,6 +113,7 @@ public void should_return_true_when_folder_is_parent_of_a_file()
         [TestCase(@"C:\Test\", @"C:\Test\mydir")]
         [TestCase(@"C:\Test\", @"C:\Test\mydir\")]
         [TestCase(@"C:\Test", @"C:\Test\30.Rock.S01E01.Pilot.avi")]
+        [TestCase(@"C:\", @"C:\Test\30.Rock.S01E01.Pilot.avi")]
         public void path_should_be_parent(string parentPath, string childPath)
         {
             parentPath.AsOsAgnostic().IsParentPath(childPath.AsOsAgnostic()).Should().BeTrue();
diff --git a/src/NzbDrone.Common/Extensions/PathExtensions.cs b/src/NzbDrone.Common/Extensions/PathExtensions.cs
index e03f0a594..7576d454a 100644
--- a/src/NzbDrone.Common/Extensions/PathExtensions.cs
+++ b/src/NzbDrone.Common/Extensions/PathExtensions.cs
@@ -80,11 +80,11 @@ public static string GetParentPath(this string childPath)
 
         public static bool IsParentPath(this string parentPath, string childPath)
         {
-            if (parentPath != "/")
+            if (parentPath != "/" && !parentPath.EndsWith(":\\"))
             {
                 parentPath = parentPath.TrimEnd(Path.DirectorySeparatorChar);
             }
-            if (childPath != "/")
+            if (childPath != "/" && !parentPath.EndsWith(":\\"))
             {
                 childPath = childPath.TrimEnd(Path.DirectorySeparatorChar);
             }
@@ -276,4 +276,4 @@ public static string GetNlogConfigPath(this IAppFolderInfo appFolderInfo)
             return Path.Combine(appFolderInfo.StartUpFolder, NLOG_CONFIG_FILE);
         }
     }
-}
\ No newline at end of file
+}
diff --git a/src/NzbDrone.Core/HealthCheck/Checks/MountCheck.cs b/src/NzbDrone.Core/HealthCheck/Checks/MountCheck.cs
index 263ae2927..6e79be2d6 100644
--- a/src/NzbDrone.Core/HealthCheck/Checks/MountCheck.cs
+++ b/src/NzbDrone.Core/HealthCheck/Checks/MountCheck.cs
@@ -21,8 +21,8 @@ public override HealthCheck Check()
             // Not best for optimization but due to possible symlinks and junctions, we get mounts based on series path so internals can handle mount resolution.
             var mounts = _seriesService.GetAllSeries()
                                        .Select(series => _diskProvider.GetMount(series.Path))
+                                       .Where(m => m != null && m.MountOptions != null && m.MountOptions.IsReadOnly)
                                        .DistinctBy(m => m.RootDirectory)
-                                       .Where(m => m.MountOptions != null && m.MountOptions.IsReadOnly)
                                        .ToList();
 
             if (mounts.Any())