diff --git a/subsys/bluetooth/controller/ll_sw/nordic/lll/lll_vendor.h b/subsys/bluetooth/controller/ll_sw/nordic/lll/lll_vendor.h
index a1fdc8a059f..9890ed1295c 100644
--- a/subsys/bluetooth/controller/ll_sw/nordic/lll/lll_vendor.h
+++ b/subsys/bluetooth/controller/ll_sw/nordic/lll/lll_vendor.h
@@ -8,7 +8,7 @@
 #define EVENT_OVERHEAD_PREEMPT_US     0    /* if <= min, then dynamic preempt */
 #define EVENT_OVERHEAD_PREEMPT_MIN_US 0
 #define EVENT_OVERHEAD_PREEMPT_MAX_US EVENT_OVERHEAD_XTAL_US
-#define EVENT_OVERHEAD_START_US       200
+#define EVENT_OVERHEAD_START_US       300
 /* Worst-case time margin needed after event end-time in the air
  * (done/preempt race margin + power-down/chain delay)
  */