diff --git a/Sources/Directory.Build.props b/Sources/Directory.Build.props
index fdadf85..1e84e63 100644
--- a/Sources/Directory.Build.props
+++ b/Sources/Directory.Build.props
@@ -14,7 +14,7 @@
     <PropertyGroup>
         <RepositoryUrl>https://github.com/kysect/Kysect.CommonLib</RepositoryUrl>
         <PackageProjectUrl>https://github.com/kysect/Kysect.CommonLib</PackageProjectUrl>
-        <Version>0.1.19</Version>
+        <Version>0.1.20</Version>
     </PropertyGroup>
 
     <!-- Code configuration -->
diff --git a/Sources/Kysect.CommonLib/FileSystem/DirectoryExtensions.cs b/Sources/Kysect.CommonLib/FileSystem/DirectoryExtensions.cs
index 91d4ac0..1e58357 100644
--- a/Sources/Kysect.CommonLib/FileSystem/DirectoryExtensions.cs
+++ b/Sources/Kysect.CommonLib/FileSystem/DirectoryExtensions.cs
@@ -5,7 +5,7 @@ namespace Kysect.CommonLib.FileSystem;
 
 public static class DirectoryExtensions
 {
-    public static void EnsureParentDirectoryExists(IFileSystem fileSystem, string path)
+    public static void EnsureParentDirectoryExists(this IFileSystem fileSystem, string path)
     {
         fileSystem.ThrowIfNull();
         path.ThrowIfNull();
@@ -14,7 +14,7 @@ public static void EnsureParentDirectoryExists(IFileSystem fileSystem, string pa
         EnsureParentDirectoryExists(fileSystem, fileInfo);
     }
 
-    public static void EnsureParentDirectoryExists(IFileSystem fileSystem, IFileInfo file)
+    public static void EnsureParentDirectoryExists(this IFileSystem fileSystem, IFileInfo file)
     {
         fileSystem.ThrowIfNull();
         file.ThrowIfNull();
@@ -25,7 +25,7 @@ public static void EnsureParentDirectoryExists(IFileSystem fileSystem, IFileInfo
         EnsureDirectoryExists(fileSystem, file.Directory);
     }
 
-    public static void EnsureDirectoryExists(IFileSystem fileSystem, IDirectoryInfo directory)
+    public static void EnsureDirectoryExists(this IFileSystem fileSystem, IDirectoryInfo directory)
     {
         fileSystem.ThrowIfNull();
         directory.ThrowIfNull();
@@ -33,7 +33,7 @@ public static void EnsureDirectoryExists(IFileSystem fileSystem, IDirectoryInfo
         EnsureDirectoryExists(fileSystem, directory.FullName);
     }
 
-    public static void EnsureDirectoryExists(IFileSystem fileSystem, string path)
+    public static void EnsureDirectoryExists(this IFileSystem fileSystem, string path)
     {
         fileSystem.ThrowIfNull();
         path.ThrowIfNull();