2 files changed, 5 insertions, 1 deletions

diff --git a/src/Directory.wixproj.targets b/src/Directory.wixproj.targets
index c9fb4f5c..b509d0a7 100644
--- a/src/Directory.wixproj.targets
+++ b/src/Directory.wixproj.targets
@@ -6,10 +6,14 @@
           DependsOnTargets="__SetPropertiesFromGit"
           AfterTargets="_CreateProjectDefineConstants">
     <PropertyGroup>
+      <PrereleaseSuffix Condition=" '$(GitSemVerDashLabel)'!='' ">-prerelease</PrereleaseSuffix>
+
       <DefineConstants>
         $(DefineConstants);
         SetupVersion=$(PackageVersion);
         SetupMajorMinorVersion=$(GitBaseVersionMajor).$(GitBaseVersionMinor);
+        SetupDashedMajorMinorVersion=$(GitBaseVersionMajor)-$(GitBaseVersionMinor);
+        SetupDashedPrerelease=$(PrereleaseSuffix)
       </DefineConstants>
     </PropertyGroup>
   </Target>
diff --git a/src/setup/WixAdditionalTools/WixAdditionalTools.wxl b/src/setup/WixAdditionalTools/WixAdditionalTools.wxl
index 74e1a1e3..89054f19 100644
--- a/src/setup/WixAdditionalTools/WixAdditionalTools.wxl
+++ b/src/setup/WixAdditionalTools/WixAdditionalTools.wxl
@@ -8,5 +8,5 @@
     <String Id="AboutUrl" Overridable="yes" Value="https://wixtoolset.org/" />
     <String Id="LicenseUrl" Overridable="yes" Value="https://wixtoolset.org/about/license/" />
     <String Id="SupportUrl" Overridable="yes" Value="https://wixtoolset.org/documentation/" />
-    <String Id="UpdateUrl" Overridable="yes" Value="https://wixtoolset.org/releases/feed/v$(SetupMajorMinorVersion)" />
+    <String Id="UpdateUrl" Overridable="yes" Value="https://wixtoolset.org/releases/feeds/wix-additional-tools-$(SetupDashedMajorMinorVersion)$(SetupDashedPrerelease).feed" />
 </WixLocalization>