diff --git a/src/rebar_appups.erl b/src/rebar_appups.erl
index 0dc113f..923dad5 100644
--- a/src/rebar_appups.erl
+++ b/src/rebar_appups.erl
@@ -47,7 +47,7 @@
                       rebar_rel_utils:get_previous_release_path()]),
 
     %% Get the new and old release name and versions
-    {Name, _Ver} = rebar_rel_utils:get_reltool_release_info(ReltoolFile),
+    {Name, _Ver} = rebar_rel_utils:get_reltool_release_info(ReltoolConfig),
     NewVerPath = filename:join([TargetParentDir, Name]),
     {NewName, NewVer} = rebar_rel_utils:get_rel_release_info(Name, NewVerPath),
     {OldName, OldVer} = rebar_rel_utils:get_rel_release_info(Name, OldVerPath),