diff --git a/libfprint/fpi-device.c b/libfprint/fpi-device.c
index 59bb074f..9500b3ac 100644
--- a/libfprint/fpi-device.c
+++ b/libfprint/fpi-device.c
@@ -71,7 +71,9 @@ error_to_string (GError * error)
   else if (error->domain == G_USB_DEVICE_ERROR)
     domain_str = g_strdup_printf ("G_USB_DEVICE_ERROR_%u", error->code);
   else
-    domain_str = g_strdup_printf ("UNKNOWN_ERROR_%u", error->domain);
+    domain_str = g_strdup_printf ("%s_%u",
+                                  g_quark_to_string (error->domain),
+                                  error->code);
 
   return g_strdup_printf ("[%s] %s", domain_str, error->message);
 }