diff --git a/extension/BuildPhpExtension/private/Add-Package.ps1 b/extension/BuildPhpExtension/private/Add-Package.ps1
index 36a822c5..b30351c4 100644
--- a/extension/BuildPhpExtension/private/Add-Package.ps1
+++ b/extension/BuildPhpExtension/private/Add-Package.ps1
@@ -104,7 +104,7 @@ function Add-Package {
                     }
                 }
             }
-            Add-Content "artifact=$artifact" -Path $env:GITHUB_OUTPUT -Encoding utf8
+            Add-Content "artifact=$artifact.zip" -Path $env:GITHUB_OUTPUT -Encoding utf8
 
             7z a -sdel "$artifact.zip" *
 
@@ -122,4 +122,4 @@ function Add-Package {
     }
     end {
     }
-}
\ No newline at end of file
+}