diff --git a/src/Squirrel/UpdateManager.ApplyReleases.cs b/src/Squirrel/UpdateManager.ApplyReleases.cs
index 43e51c2e0..b0d26be51 100644
--- a/src/Squirrel/UpdateManager.ApplyReleases.cs
+++ b/src/Squirrel/UpdateManager.ApplyReleases.cs
@@ -24,7 +24,7 @@ internal class ApplyReleasesImpl : IEnableLogger
 
             public ApplyReleasesImpl(string rootAppDirectory)
             {
-                this.rootAppDirectory = rootAppDirectory;
+                this.rootAppDirectory = rootAppDirectory.EndsWith("\\") ? rootAppDirectory : rootAppDirectory + "\\";
             }
 
             public async Task<string> ApplyReleases(UpdateInfo updateInfo, bool silentInstall, bool attemptingFullInstall, Action<int> progress = null)