diff --git a/src/Tgstation.Server.Host/Components/Byond/ByondManager.cs b/src/Tgstation.Server.Host/Components/Byond/ByondManager.cs
index 49456d01ae..157107228a 100644
--- a/src/Tgstation.Server.Host/Components/Byond/ByondManager.cs
+++ b/src/Tgstation.Server.Host/Components/Byond/ByondManager.cs
@@ -423,10 +423,10 @@ namespace Tgstation.Server.Host.Components.Byond
 			{
 				if (customVersionStream != null)
 				{
-					int customInstallationNumber = 1;
+					var customInstallationNumber = 1;
 					do
 					{
-						version = new Version(version.Major, version.Minor, customInstallationNumber);
+						version = new Version(version.Major, version.Minor, customInstallationNumber++);
 					}
 					while (installedVersions.ContainsKey(version));
 				}