diff --git a/src/leveled_penciller.erl b/src/leveled_penciller.erl
index ac9ee5c..32ee3bc 100644
--- a/src/leveled_penciller.erl
+++ b/src/leveled_penciller.erl
@@ -1676,7 +1676,7 @@ coverage_test() ->
     ok = pcl_close(PCL),
     
     ManifestFP = filepath(RootPath, manifest),
-    ok = file:write_file(ManifestFP ++ "/yeszero_123.man", term_to_binary("hello")),
+    ok = file:write_file(filename:join(ManifestFP, "yeszero_123.man"), term_to_binary("hello")),
     {ok, PCLr} = pcl_start(#penciller_options{root_path=RootPath,
                                                 max_inmemory_tablesize=1000}),
     ?assertMatch(Key1, pcl_fetch(PCLr, {o,"Bucket0001", "Key0001", null})),