diff --git a/subsys/bluetooth/host/hci_core.c b/subsys/bluetooth/host/hci_core.c
index 1b2a795937b..c3e22d560ed 100644
--- a/subsys/bluetooth/host/hci_core.c
+++ b/subsys/bluetooth/host/hci_core.c
@@ -2354,7 +2354,7 @@ static int prng_reseed(struct tc_hmac_prng_struct *h)
 		net_buf_unref(rsp);
 	}
 
-	extra = sys_tick_get();
+	extra = k_uptime_get();
 
 	ret = tc_hmac_prng_reseed(h, seed, sizeof(seed), (uint8_t *)&extra,
 				  sizeof(extra));
diff --git a/subsys/bluetooth/host/monitor.c b/subsys/bluetooth/host/monitor.c
index a3d0235b18f..10274077662 100644
--- a/subsys/bluetooth/host/monitor.c
+++ b/subsys/bluetooth/host/monitor.c
@@ -65,7 +65,7 @@ static inline void encode_hdr(struct bt_monitor_hdr *hdr, uint16_t opcode,
 
 	/* Extended header */
 	hdr->type = BT_MONITOR_TS32;
-	ts32 = sys_tick_get_32() * sys_clock_us_per_tick / 100;
+	ts32 = k_uptime_get() * 10;
 	hdr->ts32 = sys_cpu_to_le32(ts32);
 }