diff --git a/lib/diameter/test/diameter_tls_SUITE.erl b/lib/diameter/test/diameter_tls_SUITE.erl
index 65829d394081..e6034f42a53b 100644
--- a/lib/diameter/test/diameter_tls_SUITE.erl
+++ b/lib/diameter/test/diameter_tls_SUITE.erl
@@ -50,7 +50,7 @@
          end_per_testcase/2,
         
          %% The test cases
-         parallel/1
+         test/1
         ]).
 
 %% diameter callbacks
@@ -134,7 +134,7 @@ suite() ->
     [{timetrap, {seconds, 90}}].
 
 all() ->
-    [parallel].
+    [test].
 
 %% Shouldn't really have to know about crypto here but 'ok' from
 %% ssl:start() isn't enough to guarantee that TLS is available.
@@ -142,7 +142,7 @@ init_per_suite(Config) ->
     ?TL("init_per_suite -> entry with"
         "~n   Config: ~p", [Config]),
     try
-        [] == (catch make_certs(dir(Config)))
+        ok == (catch make_certs(dir(Config)))
             orelse throw({?MODULE, no_certs}),
         ok == application:start(crypto) orelse throw({?MODULE, no_crypto}),
         ok == ssl:start() orelse throw({?MODULE, no_ssl}),
@@ -186,10 +186,10 @@ end_per_testcase(Case, Config) when is_list(Config) ->
 
 %% ===========================================================================
 
-parallel(Config) ->
-    ?TL("parallel -> entry"),
+test(Config) ->
+    ?TL("test -> entry"),
     Res = run(dir(Config), false),
-    ?TL("parallel -> done when"
+    ?TL("test -> done when"
         "~n   Res: ~p", [Res]),
     Res.
 
@@ -214,7 +214,7 @@ run(Dir, B) ->
     ssl:start(),
     try
         ?TL("run -> try run traffic"),
-        ?RUN([{[fun traffic/2, Dir, B], 60000}])
+        traffic(Dir, B)
     after
         ?TL("run(after) -> stop diameter"),
         diameter:stop(),
@@ -239,7 +239,7 @@ traffic(Dir, false) ->
     ?TL("traffic(false) -> add transports"),
     Connections = add_transports(Dir, Servers),
     ?TL("traffic(false) -> calls"),
-    [] = ?RUN([[fun call/1, S] || S <- ?SCRAMBLE(?SERVERS)]),
+    [ok = call(S) || S <- ?SCRAMBLE(?SERVERS)],
     ?TL("traffic(false) -> remove transports"),
     [] = remove_transports(Connections),
     ?TL("traffic(false) -> stop (diameter) services"),
@@ -248,11 +248,12 @@ traffic(Dir, false) ->
     ok.
 
 make_certs(Dir) ->
-    ?RUN([[fun make_cert/2, Dir, B] || B <- ["server1",
-                                             "server2",
-                                             "server4",
-                                             "server5",
-                                             "client"]]).
+    [make_cert(Dir, B) || B <- ["server1",
+                                "server2",
+                                "server4",
+                                "server5",
+                                "client"]],
+    ok.
 
 start_services(Dir) ->
     lists:foreach(fun(S) -> ?DEL_REG(S) end, ?SERVERS ++ [?CLIENT]),
@@ -269,7 +270,7 @@ add_transports(Dir, Servers) ->
 %% transport to go down.
 remove_transports(Connections) ->
     [] = [T || S <- ?SERVERS, T <- [diameter:subscribe(S)], T /= true],
-    [] = ?RUN([[fun disconnect/1, T] || T <- Connections]),
+    [disconnect(T) || T <- Connections],
     [S || S <- ?SERVERS,
           I <- [receive #diameter_event{service = S, info = I} -> I end],
           down /= catch element(1, I)].