diff --git a/source/TestAdapter/Discover.cs b/source/TestAdapter/Discover.cs
index a9df2c0..655f926 100644
--- a/source/TestAdapter/Discover.cs
+++ b/source/TestAdapter/Discover.cs
@@ -222,7 +222,7 @@ private static string[] GetAllCsFiles(FileInfo[] nfprojFiles)
 
                 foreach (System.Text.RegularExpressions.Match compileItem in compileItems)
                 {
-                    allCsFiles.Add($"{Path.GetFullPath(nfproj.DirectoryName)}\\{compileItem.Groups["source_file"].Value}");
+                    allCsFiles.Add($"{Path.Combine(Path.GetFullPath(nfproj.DirectoryName), compileItem.Groups["source_file"].Value)}");
                 }
             }