diff --git a/eng/common/scripts/Package-Properties.ps1 b/eng/common/scripts/Package-Properties.ps1
index 999d818b4b03..1784521252df 100644
--- a/eng/common/scripts/Package-Properties.ps1
+++ b/eng/common/scripts/Package-Properties.ps1
@@ -187,12 +187,17 @@ function Get-PrPkgProperties([string]$InputDiffJson) {
         }
     }
 
+    $existingPackageNames = @($packagesWithChanges | ForEach-Object { $_.Name })
     foreach ($addition in $additionalValidationPackages) {
         $key = $addition.Replace($RepoRoot, "").TrimStart('\/')
 
         if ($lookup[$key]) {
-            $lookup[$key].IncludedForValidation = $true
-            $packagesWithChanges += $lookup[$key]
+            $pkg = $lookup[$key]
+
+            if ($pkg.Name -notin $existingPackageNames) {
+                $pkg.IncludedForValidation = $true
+                $packagesWithChanges += $pkg
+            }
         }
     }