diff --git a/test/run_decoder.c b/test/run_decoder.c
index 72e0783f0..47cab2aac 100644
--- a/test/run_decoder.c
+++ b/test/run_decoder.c
@@ -30,6 +30,16 @@
 #include <assert.h>
 #include <unistd.h>
 
+static void
+my_log_func(const gchar *log_domain, G_GNUC_UNUSED GLogLevelFlags log_level,
+	    const gchar *message, G_GNUC_UNUSED gpointer user_data)
+{
+	if (log_domain != NULL)
+		g_printerr("%s: %s\n", log_domain, message);
+	else
+		g_printerr("%s\n", message);
+}
+
 /**
  * No-op dummy.
  */
@@ -139,6 +149,8 @@ int main(int argc, char **argv)
 	decoder_name = argv[1];
 	decoder.uri = argv[2];
 
+	g_log_set_default_handler(my_log_func, NULL);
+
 	input_stream_global_init();
 	decoder_plugin_init_all();
 
diff --git a/test/run_filter.c b/test/run_filter.c
index 62cafdbc1..c1fb50879 100644
--- a/test/run_filter.c
+++ b/test/run_filter.c
@@ -31,6 +31,16 @@
 #include <errno.h>
 #include <unistd.h>
 
+static void
+my_log_func(const gchar *log_domain, G_GNUC_UNUSED GLogLevelFlags log_level,
+	    const gchar *message, G_GNUC_UNUSED gpointer user_data)
+{
+	if (log_domain != NULL)
+		g_printerr("%s: %s\n", log_domain, message);
+	else
+		g_printerr("%s\n", message);
+}
+
 static const struct config_param *
 find_named_config_block(const char *block, const char *name)
 {
@@ -87,7 +97,10 @@ int main(int argc, char **argv)
 
 	audio_format_init(&audio_format, 44100, SAMPLE_FORMAT_S16, 2);
 
+	/* initialize GLib */
+
 	g_thread_init(NULL);
+	g_log_set_default_handler(my_log_func, NULL);
 
 	/* read configuration file (mpd.conf) */