diff --git a/azure-pipelines.yml b/azure-pipelines.yml
index 59a367b7..cb3df420 100644
--- a/azure-pipelines.yml
+++ b/azure-pipelines.yml
@@ -30,7 +30,9 @@ steps:
     write-host "Build number $buildNumber" -fore white
     $nugetPrerelease = if ($Env:SourceBranch.StartsWith("refs/heads/release/")) { $version.Prerelease } else { "build$($buildNumber.ToString("D6"))" }
     write-host "Prerelease $nugetPrerelease" -fore white
-    .\Build\runbuild.ps1 -properties @{"majorVersion"="$($version.Major).0"; "majorWithReleaseVersion"="$($version.Major).0.$($version.Release)"; "nugetPrerelease"=$nugetPrerelease; "assemblyVersion"=$version.Assembly; "zipFileName"="Json$($version.Major)0r$($version.Release).zip"; "signAssemblies"=$sign; "signKeyPath"=$keyPath; "treatWarningsAsErrors"=$true; "buildNuGet"=$true}
+    $assemblyVersion = if (version.Assembly) { $version.Assembly } else { "$($version.Major).0.0.0" }
+    write-host "Assembly $assemblyVersion" -fore white
+    .\Build\runbuild.ps1 -properties @{"majorVersion"="$($version.Major).0"; "majorWithReleaseVersion"="$($version.Major).0.$($version.Release)"; "nugetPrerelease"=$nugetPrerelease; "assemblyVersion"=$assemblyVersion; "zipFileName"="Json$($version.Major)0r$($version.Release).zip"; "signAssemblies"=$sign; "signKeyPath"=$keyPath; "treatWarningsAsErrors"=$true; "buildNuGet"=$true}
   env:
     BuildId: $(Build.BuildId)
     SourceBranch: $(Build.SourceBranch)