diff --git a/gio/tests/fake-document-portal.c b/gio/tests/fake-document-portal.c
index 0ef86b59a..585dee58b 100644
--- a/gio/tests/fake-document-portal.c
+++ b/gio/tests/fake-document-portal.c
@@ -125,6 +125,8 @@ main (gint argc, gchar *argv[])
   GMainLoop *loop;
   guint id;
 
+  g_log_writer_default_set_use_stderr (TRUE);
+
   loop = g_main_loop_new (NULL, FALSE);
 
   id = g_bus_own_name (G_BUS_TYPE_SESSION,
diff --git a/gio/tests/fake-service-name.c b/gio/tests/fake-service-name.c
index 6e317a7cc..0acabd9ec 100644
--- a/gio/tests/fake-service-name.c
+++ b/gio/tests/fake-service-name.c
@@ -98,6 +98,8 @@ main (gint argc, gchar *argv[])
 {
   guint id;
 
+  g_log_writer_default_set_use_stderr (TRUE);
+
   loop = g_main_loop_new (NULL, FALSE);
   introspection_data = g_dbus_node_info_new_for_xml (introspection_xml, NULL);
   g_assert (introspection_data != NULL);
diff --git a/gio/tests/gapplication.c b/gio/tests/gapplication.c
index 4320352d1..a11f2b8bc 100644
--- a/gio/tests/gapplication.c
+++ b/gio/tests/gapplication.c
@@ -1686,6 +1686,8 @@ main (int argc, char **argv)
 {
   g_setenv ("LC_ALL", "C", TRUE);
 
+  g_log_writer_default_set_use_stderr (TRUE);
+
   g_test_init (&argc, &argv, NULL);
 
   if (!g_test_subprocess ())
diff --git a/gio/tests/gdbus-testserver.c b/gio/tests/gdbus-testserver.c
index ae8e47b18..3a16db378 100644
--- a/gio/tests/gdbus-testserver.c
+++ b/gio/tests/gdbus-testserver.c
@@ -843,6 +843,8 @@ main (int argc, char *argv[])
 {
   guint owner_id;
 
+  g_log_writer_default_set_use_stderr (TRUE);
+
   introspection_data = g_dbus_node_info_new_for_xml (introspection_xml, NULL);
   properties = g_hash_table_new_full (g_str_hash, g_str_equal, g_free, (GDestroyNotify)g_variant_unref);
   g_hash_table_insert (properties, g_strdup ("y"), g_variant_ref_sink (g_variant_new_byte (1)));