diff --git a/BuildTasks/SetVersion.Task.ps1 b/BuildTasks/SetVersion.Task.ps1
index bb023f7..1587856 100644
--- a/BuildTasks/SetVersion.Task.ps1
+++ b/BuildTasks/SetVersion.Task.ps1
@@ -62,14 +62,10 @@ task SetVersion {
         "Downloading published module to check for breaking changes"
         $publishedModule | Save-Module -Path $downloadFolder
 
-        [System.Collections.Generic.HashSet[string]] $publishedInterface = GetModulePublicInterfaceMap -Path (Join-Path $downloadFolder $ModuleName)
-        [System.Collections.Generic.HashSet[string]] $buildInterface = GetModulePublicInterfaceMap -Path $ManifestPath
-        if ($null -eq $publishedInterface)
-        {
-            $publishedInterface = [System.Collections.Generic.HashSet[string]]::new()
-        }
+        [System.Collections.Generic.HashSet[string]] $publishedInterface = @(GetModulePublicInterfaceMap -Path (Join-Path $downloadFolder $ModuleName))
+        [System.Collections.Generic.HashSet[string]] $buildInterface = @(GetModulePublicInterfaceMap -Path $ManifestPath)
 
-        if( -not $publishedInterface.IsSubsetOf($buildInterface))
+        if (-not $publishedInterface.IsSubsetOf($buildInterface))
         {
             $bumpVersionType = 'Major'
         }