diff --git a/eng/common/scripts/Detect-Api-Changes.ps1 b/eng/common/scripts/Detect-Api-Changes.ps1
index 9a09df8baa2..b5c8acc2461 100644
--- a/eng/common/scripts/Detect-Api-Changes.ps1
+++ b/eng/common/scripts/Detect-Api-Changes.ps1
@@ -73,7 +73,7 @@ function Should-Process-Package($pkgPath, $packageName)
     # Get package info from json file created before updating version to daily dev
     $pkgInfo = Get-Content $pkgPropPath | ConvertFrom-Json
     $packagePath = $pkgInfo.DirectoryPath
-    $modifiedFiles  = Get-ChangedFiles -DiffPath "$packagePath/*" -DiffFilterType ''
+    $modifiedFiles  = @(Get-ChangedFiles -DiffPath "$packagePath/*" -DiffFilterType '')
     $filteredFileCount = $modifiedFiles.Count
     Write-Host "Number of modified files for package: $filteredFileCount"
     return ($filteredFileCount -gt 0 -and $pkgInfo.IsNewSdk)