diff --git a/src/nix/profile.cc b/src/nix/profile.cc
index 667904cd2..e511c4c3e 100644
--- a/src/nix/profile.cc
+++ b/src/nix/profile.cc
@@ -426,7 +426,7 @@ struct CmdProfileUpgrade : virtual SourceExprCommand, MixDefaultProfile, MixProf
                     attrPath,
                 };
 
-                pathsToBuild.push_back(DerivedPath::Built{drv.drvPath, {"out"}}); // FIXME
+                pathsToBuild.push_back(DerivedPath::Built{drv.drvPath, {drv.outputName}});
             }
         }