diff --git a/client/cd-fix-profile.c b/client/cd-fix-profile.c
index 5fbd3372..3e90e485 100644
--- a/client/cd-fix-profile.c
+++ b/client/cd-fix-profile.c
@@ -686,7 +686,7 @@ main (int argc, char *argv[])
 
 	/* set verbose? */
 	if (verbose) {
-		g_setenv ("COLORD_VERBOSE", "1", FALSE);
+		(void)g_setenv ("COLORD_VERBOSE", "1", FALSE);
 	} else {
 		g_log_set_handler (G_LOG_DOMAIN, G_LOG_LEVEL_DEBUG,
 				   cd_util_ignore_cb, NULL);
diff --git a/client/cd-it8.c b/client/cd-it8.c
index a64fbcad..7f141e84 100644
--- a/client/cd-it8.c
+++ b/client/cd-it8.c
@@ -526,7 +526,7 @@ main (int argc, char *argv[])
 
 	/* set verbose? */
 	if (verbose) {
-		g_setenv ("COLORD_VERBOSE", "1", FALSE);
+		(void)g_setenv ("COLORD_VERBOSE", "1", FALSE);
 	} else {
 		g_log_set_handler (G_LOG_DOMAIN, G_LOG_LEVEL_DEBUG,
 				   cd_util_ignore_cb, NULL);
diff --git a/client/cd-util.c b/client/cd-util.c
index 10ac2ebb..bb4f94fc 100644
--- a/client/cd-util.c
+++ b/client/cd-util.c
@@ -2242,7 +2242,7 @@ main (int argc, char *argv[])
 
 	/* set verbose? */
 	if (verbose) {
-		g_setenv ("COLORD_VERBOSE", "1", FALSE);
+		(void)g_setenv ("COLORD_VERBOSE", "1", FALSE);
 	} else {
 		g_log_set_handler (G_LOG_DOMAIN, G_LOG_LEVEL_DEBUG,
 				   cd_util_ignore_cb, NULL);
diff --git a/lib/colord/cd-test-private.c b/lib/colord/cd-test-private.c
index 231c4aed..65fc780f 100644
--- a/lib/colord/cd-test-private.c
+++ b/lib/colord/cd-test-private.c
@@ -2072,7 +2072,7 @@ colord_icc_store_func (void)
 	g_assert_cmpint (array->len, ==, 2);
 	g_ptr_array_unref (array);
 
-	g_unlink (file2);
+	(void)g_unlink (file2);
 
 	/* wait for file notifier */
 	cd_test_loop_run_with_timeout (5000);
@@ -2082,7 +2082,7 @@ colord_icc_store_func (void)
 	g_assert_cmpint (removed, ==, 1);
 
 	/* remove already-exists.icc */
-	g_unlink (file1);
+	(void)g_unlink (file1);
 
 	/* wait for file notifier */
 	cd_test_loop_run_with_timeout (5000);
@@ -2352,7 +2352,7 @@ int
 main (int argc, char **argv)
 {
 	g_test_init (&argc, &argv, NULL);
-	g_setenv ("G_MESSAGES_DEBUG", "all", TRUE);
+	(void)g_setenv ("G_MESSAGES_DEBUG", "all", TRUE);
 
 	/* only critical and error are fatal */
 	g_log_set_fatal_mask (NULL, G_LOG_LEVEL_ERROR | G_LOG_LEVEL_CRITICAL);
diff --git a/lib/colorhug/ch-device-queue.c b/lib/colorhug/ch-device-queue.c
index 5f7a4eb6..6497bd43 100644
--- a/lib/colorhug/ch-device-queue.c
+++ b/lib/colorhug/ch-device-queue.c
@@ -2824,7 +2824,7 @@ ch_device_queue_set_owner_name (ChDeviceQueue *device_queue,
 	g_return_if_fail (name != NULL);
 
 	memset(buf, 0, CH_OWNER_LENGTH_MAX);
-	g_strlcpy(buf, name, CH_OWNER_LENGTH_MAX);
+	(void)g_strlcpy(buf, name, CH_OWNER_LENGTH_MAX);
 
 	ch_device_queue_add (device_queue,
 			     device,
@@ -2890,7 +2890,7 @@ ch_device_queue_set_owner_email (ChDeviceQueue *device_queue,
 	g_return_if_fail (email != NULL);
 
 	memset (buf, 0, CH_OWNER_LENGTH_MAX);
-	g_strlcpy (buf, email, CH_OWNER_LENGTH_MAX);
+	(void)g_strlcpy (buf, email, CH_OWNER_LENGTH_MAX);
 
 	ch_device_queue_add (device_queue,
 			     device,
diff --git a/src/cd-self-test.c b/src/cd-self-test.c
index 9206210a..fd5f3644 100644
--- a/src/cd-self-test.c
+++ b/src/cd-self-test.c
@@ -215,7 +215,7 @@ cd_mapping_db_alter_func (void)
 	g_assert (mdb != NULL);
 
 	/* setup v0.1.0 database for altering */
-	g_unlink (db_filename);
+	(void)g_unlink (db_filename);
 	rc = sqlite3_open (db_filename, &db);
 	g_assert_cmpint (rc, ==, SQLITE_OK);
 	statement = "CREATE TABLE mappings ("
@@ -264,7 +264,7 @@ cd_mapping_db_convert_func (void)
 	g_assert (mdb != NULL);
 
 	/* setup v0.1.8 database for converting */
-	g_unlink (db_filename);
+	(void)g_unlink (db_filename);
 	rc = sqlite3_open (db_filename, &db);
 	g_assert_cmpint (rc, ==, SQLITE_OK);
 	statement = "CREATE TABLE mappings ("
@@ -307,7 +307,7 @@ cd_mapping_db_func (void)
 	g_assert (mdb != NULL);
 
 	/* connect, which should create a v2 table for us */
-	g_unlink (db_filename);
+	(void)g_unlink (db_filename);
 	ret = cd_mapping_db_load (mdb, db_filename, &error);
 	g_assert_no_error (error);
 	g_assert (ret);