diff --git a/src/settings/plugins/ifnet/net_parser.c b/src/settings/plugins/ifnet/net_parser.c
index b5146ca674..38765f5fea 100644
--- a/src/settings/plugins/ifnet/net_parser.c
+++ b/src/settings/plugins/ifnet/net_parser.c
@@ -419,7 +419,7 @@ ifnet_get_data (const char *conn_name, const char *key)
 
 /* format ip values for comparison */
 static gchar*
-format_ip_for_comparison (gchar * value)
+format_ip_for_comparison (const gchar * value)
 {
 	gchar **ipset;
 	guint length, i;
diff --git a/src/settings/plugins/ifnet/net_utils.c b/src/settings/plugins/ifnet/net_utils.c
index 2040cfa252..f1687479ed 100644
--- a/src/settings/plugins/ifnet/net_utils.c
+++ b/src/settings/plugins/ifnet/net_utils.c
@@ -951,11 +951,11 @@ get_dhcp_hostname_and_client_id (char **hostname, char **client_id)
 	g_free (contents);
 }
 
-void backup_file (gchar* target)
+void backup_file (const gchar* target)
 {
 	GFile *source, *backup;
 	gchar* backup_path;
-	GError **error;
+	GError **error = NULL;
 
 	source = g_file_new_for_path (target);
 	backup_path = g_strdup_printf ("%s.bak", target);
diff --git a/src/settings/plugins/ifnet/net_utils.h b/src/settings/plugins/ifnet/net_utils.h
index fcfe348883..dee4914398 100644
--- a/src/settings/plugins/ifnet/net_utils.h
+++ b/src/settings/plugins/ifnet/net_utils.h
@@ -77,5 +77,5 @@ gboolean is_true (const char *str);
 
 void get_dhcp_hostname_and_client_id (char **hostname, char **client_id);
 
-void backup_file (gchar* target);
+void backup_file (const gchar* target);
 #endif