diff --git a/src/gen_mod.erl b/src/gen_mod.erl
index 44e890e2f..f0ece7ceb 100644
--- a/src/gen_mod.erl
+++ b/src/gen_mod.erl
@@ -159,7 +159,9 @@ sort_modules(Host, ModOpts) ->
 			end
 		end, Deps)
       end, ModOpts),
-    [digraph:vertex(G, V) || V <- digraph_utils:topsort(G)].
+    Result = [digraph:vertex(G, V) || V <- digraph_utils:topsort(G)],
+    digraph:delete(G),
+    Result.
 
 -spec start_modules(binary()) -> ok.