diff --git a/subsys/bluetooth/controller/ll_sw/ull_df.c b/subsys/bluetooth/controller/ll_sw/ull_df.c
index 64847ee8afa..1b8d062a889 100644
--- a/subsys/bluetooth/controller/ll_sw/ull_df.c
+++ b/subsys/bluetooth/controller/ll_sw/ull_df.c
@@ -490,8 +490,9 @@ uint8_t ll_df_set_cl_iq_sampling_enable(uint16_t handle,
 			/* Extend sync event by maximum CTE duration.
 			 * CTE duration depends on transmitter configuration
 			 * so it is unknown for receiver upfront.
+			 * BT_HCI_LE_CTE_LEN_MAX is in 8us units.
 			 */
-			slot_plus_us = BT_HCI_LE_CTE_LEN_MAX;
+			slot_plus_us = BT_HCI_LE_CTE_LEN_MAX * 8U;
 		}
 	}