diff --git a/src/gsm.c b/src/gsm.c
index a7d6307..7edf322 100644
--- a/src/gsm.c
+++ b/src/gsm.c
@@ -113,6 +113,7 @@ static struct
 	{ 30,	N_("No network service")			},
 	{ 31,	N_("Network timeout")				},
 	{ 32,	N_("Network not allowed - emergency calls only")},
+	{ 100,	N_("Unknown error")				},
 	{ 0,	NULL						}
 };