diff --git a/src/sim.c b/src/sim.c
index dba1e150..839edd52 100644
--- a/src/sim.c
+++ b/src/sim.c
@@ -2013,6 +2013,8 @@ static void sim_free_state(struct ofono_sim *sim)
 		sim->efest = NULL;
 		sim->efest_length = 0;
 	}
+
+	sim->mnc_length = 0;
 }
 
 void ofono_sim_inserted_notify(struct ofono_sim *sim, ofono_bool_t inserted)