diff --git a/src/sim.c b/src/sim.c
index 69e0a89e..bf285eef 100644
--- a/src/sim.c
+++ b/src/sim.c
@@ -1878,9 +1878,9 @@ void ofono_sim_inserted_notify(struct ofono_sim *sim, ofono_bool_t inserted)
 	ofono_sim_state_event_notify_cb_t notify;
 	GSList *l;
 
-	if (inserted && sim->state == OFONO_SIM_STATE_NOT_PRESENT)
+	if (inserted == TRUE && sim->state == OFONO_SIM_STATE_NOT_PRESENT)
 		sim->state = OFONO_SIM_STATE_INSERTED;
-	else if (!inserted && sim->state != OFONO_SIM_STATE_NOT_PRESENT)
+	else if (inserted == FALSE && sim->state != OFONO_SIM_STATE_NOT_PRESENT)
 		sim->state = OFONO_SIM_STATE_NOT_PRESENT;
 	else
 		return;