diff --git a/server/pw3270-plugin-ipc.cbp b/server/pw3270-plugin-ipc.cbp
index 0561ef8..f3de793 100644
--- a/server/pw3270-plugin-ipc.cbp
+++ b/server/pw3270-plugin-ipc.cbp
@@ -58,6 +58,8 @@
 		<Linker>
 			<Add option="`pkg-config --libs gtk+-3.0 lib3270 v3270 gio-2.0 dbus-1 dbus-glib-1`" />
 		</Linker>
+		<Unit filename="../common/src/include/lib3270/ipc-glib.h" />
+		<Unit filename="../common/src/include/lib3270/ipc.h" />
 		<Unit filename="src/core/constants.c">
 			<Option compilerVar="CC" />
 		</Unit>
@@ -105,9 +107,7 @@
 		<Unit filename="src/core/windows/stop.c">
 			<Option compilerVar="CC" />
 		</Unit>
-		<Unit filename="src/include/config.h" />
 		<Unit filename="src/include/config.h.in" />
-		<Unit filename="src/include/lib3270/ipc-glib.h" />
 		<Unit filename="src/plugin/plugin.c">
 			<Option compilerVar="CC" />
 		</Unit>
diff --git a/server/src/core/convert.c b/server/src/core/convert.c
index 41da8df..4b6fe8b 100644
--- a/server/src/core/convert.c
+++ b/server/src/core/convert.c
@@ -49,11 +49,11 @@ GVariant * ipc3270_GVariant_from_input_string(GObject *object, char *string, GEr
 	if(string) {
 		g_autofree gchar * utfstring = ipc3270_convert_input_string(object,string,error);
 		lib3270_free(string);
-		return g_variant_new("(s)", utfstring);
+		return g_variant_new_string(utfstring);
 	}
 
 	ipc3270_set_error(object,errno,error);
-	return g_variant_new("(s)", "");
+	return g_variant_new_string("");
 }
 
 
diff --git a/server/src/core/linux/start.c b/server/src/core/linux/start.c
index 3244033..d4a2917 100644
--- a/server/src/core/linux/start.c
+++ b/server/src/core/linux/start.c
@@ -64,7 +64,11 @@ static void
 
 	} else if(rc) {
 
-		g_dbus_method_invocation_return_value(invocation, rc);
+		// Convert rc to tuple.
+		// It is an error if parameters is not of the right format: it must be a tuple containing the out-parameters of the D-Bus method.
+		// Even if the method has a single out-parameter, it must be contained in a tuple.
+
+		g_dbus_method_invocation_return_value(invocation, g_variant_new_tuple(&rc,1));
 
 	} else {
 
diff --git a/server/valgrind.suppression b/server/valgrind.suppression
index 5166912..2e4d6aa 100644
--- a/server/valgrind.suppression
+++ b/server/valgrind.suppression
@@ -48,3 +48,53 @@
    fun:g_application_register
 }
 
+{
+   glib_dl_init
+   Memcheck:Leak
+   ...
+   fun:_dl_init
+}
+
+{
+   pango_itemize_with_base_dir
+   Memcheck:Leak
+   ...
+   fun:pango_itemize_with_base_dir
+}
+
+{
+   pango_FcDefaultSubstitute
+   Memcheck:Leak
+   ...
+   fun:FcDefaultSubstitute
+}
+
+{
+   font_config_parse
+   Memcheck:Leak
+   ...
+   fun:FcConfigParseAndLoad
+}
+
+{
+   g_type_register_static
+   Memcheck:Leak
+   ...
+   fun:g_type_register_static
+}
+
+{
+   glib_g_task_run_in_thread
+   Memcheck:Leak
+   ...
+   fun:g_task_run_in_thread
+}
+
+{
+   gio_g_bus_get_sync
+   Memcheck:Leak
+   ...
+   fun:g_bus_get_sync
+}
+
+
--
libgit2 0.21.2