diff --git a/src/applications/harbormaster/step/HarbormasterUploadArtifactBuildStepImplementation.php b/src/applications/harbormaster/step/HarbormasterUploadArtifactBuildStepImplementation.php
--- a/src/applications/harbormaster/step/HarbormasterUploadArtifactBuildStepImplementation.php
+++ b/src/applications/harbormaster/step/HarbormasterUploadArtifactBuildStepImplementation.php
@@ -35,7 +35,8 @@
       $variables);
 
     $artifact = $build_target->loadArtifact($settings['hostartifact']);
-    $lease = $artifact->loadDrydockLease();
+    $impl = $artifact->getArtifactImplementation();
+    $lease = $impl->loadArtifactLease();
 
     $interface = $lease->getInterface('filesystem');