---
 plugins/udevng.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/plugins/udevng.c b/plugins/udevng.c
index e8b800c1..4d928d02 100644
--- a/plugins/udevng.c
+++ b/plugins/udevng.c
@@ -224,8 +224,15 @@ static gboolean setup_gobi(struct modem_info *modem)
 		}
 	}
 
-	if (qmi == NULL || mdm == NULL || net == NULL)
+	if (qmi == NULL || mdm == NULL || net == NULL) {
+		if (!qmi)
+			DBG("mandatory qmi interface missing");
+		if (!mdm)
+			DBG("mandatory mdm interface missing");
+		if (!net)
+			DBG("mandatory net interface missing");
 		return FALSE;
+	}
 
 	DBG("qmi=%s net=%s mdm=%s gps=%s diag=%s", qmi, net, mdm, gps, diag);
 
-- 
2.12.2