diff --git a/DotNetAstGen/Program.cs b/DotNetAstGen/Program.cs
index 19e1dd1..f252807 100644
--- a/DotNetAstGen/Program.cs
+++ b/DotNetAstGen/Program.cs
@@ -58,7 +58,7 @@ public static void Main(string[] args)
 
                     // Handle .cs
                     _ParseSourceCode(
-                        options.InputFilePath,
+                        new DirectoryInfo(options.InputFilePath),
                         new DirectoryInfo(options.OutputDirectory),
                         options.ExclusionRegex);
 
@@ -69,13 +69,15 @@ public static void Main(string[] args)
                 });
         }
 
-        private static void _ParseSourceCode(string inputPath, DirectoryInfo rootOutputPath, string? exclusionRegex)
+        private static void _ParseSourceCode(DirectoryInfo inputDirPath, DirectoryInfo rootOutputPath, string? exclusionRegex)
         {
             if (!rootOutputPath.Exists)
             {
                 rootOutputPath.Create();
             }
 
+            var inputPath = inputDirPath.FullName;
+
             if (Directory.Exists(inputPath))
             {
                 _logger?.LogInformation("Parsing directory {dirName}", inputPath);