diff --git a/src/ejabberd_zlib/ejabberd_zlib.erl b/src/ejabberd_zlib/ejabberd_zlib.erl
index 663640c42..22a121d14 100644
--- a/src/ejabberd_zlib/ejabberd_zlib.erl
+++ b/src/ejabberd_zlib/ejabberd_zlib.erl
@@ -63,7 +63,7 @@ init([]) ->
 	ok -> ok;
 	{error, already_loaded} -> ok
     end,
-    Port = open_port({spawn, ejabberd_zlib_drv}, [binary]),
+    Port = open_port({spawn, "ejabberd_zlib_drv"}, [binary]),
     {ok, Port}.
 
 
@@ -99,7 +99,7 @@ enable_zlib(SockMod, Socket) ->
 	ok -> ok;
 	{error, already_loaded} -> ok
     end,
-    Port = open_port({spawn, ejabberd_zlib_drv}, [binary]),
+    Port = open_port({spawn, "ejabberd_zlib_drv"}, [binary]),
     {ok, #zlibsock{sockmod = SockMod, socket = Socket, zlibport = Port}}.
 
 disable_zlib(#zlibsock{sockmod = SockMod, socket = Socket, zlibport = Port}) ->
diff --git a/src/tls/tls.erl b/src/tls/tls.erl
index 17bd8f286..2b3359aef 100644
--- a/src/tls/tls.erl
+++ b/src/tls/tls.erl
@@ -74,7 +74,7 @@ init([]) ->
 	ok -> ok;
 	{error, already_loaded} -> ok
     end,
-    Port = open_port({spawn, tls_drv}, [binary]),
+    Port = open_port({spawn, "tls_drv"}, [binary]),
     Res = port_control(Port, ?SET_CERTIFICATE_FILE_ACCEPT, "./ssl.pem" ++ [0]),
     case Res of
 	<<0>> ->
@@ -120,7 +120,7 @@ tcp_to_tls(TCPSocket, Options) ->
 		ok -> ok;
 		{error, already_loaded} -> ok
 	    end,
-	    Port = open_port({spawn, tls_drv}, [binary]),
+	    Port = open_port({spawn, "tls_drv"}, [binary]),
 	    Flags =
 		case lists:member(verify_none, Options) of
 		    true ->
@@ -252,7 +252,7 @@ test() ->
 	ok -> ok;
 	{error, already_loaded} -> ok
     end,
-    Port = open_port({spawn, tls_drv}, [binary]),
+    Port = open_port({spawn, "tls_drv"}, [binary]),
     ?PRINT("open_port: ~p~n", [Port]),
     PCRes = port_control(Port, ?SET_CERTIFICATE_FILE_ACCEPT,
 			 "./ssl.pem" ++ [0]),