diff --git a/src/nix/profile.cc b/src/nix/profile.cc
index 0b7c7402c..e5e8d7154 100644
--- a/src/nix/profile.cc
+++ b/src/nix/profile.cc
@@ -186,7 +186,7 @@ struct ProfileManifest
             for (auto & packageInfo : packageInfos) {
                 ProfileElement element;
                 element.storePaths = {packageInfo.queryOutPath()};
-                element.priority = packageInfo.queryMetaInt("priority", NixInt{defaultPriority});
+                element.priority = packageInfo.queryMetaInt("priority", NixInt{defaultPriority}).value;
                 addElement(std::move(element));
             }
         }