diff --git a/libmm-glib/mm-manager.c b/libmm-glib/mm-manager.c
index 6fa2f0e0..975f13ca 100644
--- a/libmm-glib/mm-manager.c
+++ b/libmm-glib/mm-manager.c
@@ -429,7 +429,7 @@ scan_devices_ready (MmGdbusOrgFreedesktopModemManager1 *manager_iface_proxy,
 {
     GError *error = NULL;
 
-    if (mm_gdbus_org_freedesktop_modem_manager1_call_scan_devices_finish (
+    if (!mm_gdbus_org_freedesktop_modem_manager1_call_scan_devices_finish (
             manager_iface_proxy,
             res,
             &error))