diff --git a/eth/catalyst/simulated_beacon.go b/eth/catalyst/simulated_beacon.go
index 31e49cab1c..8bdf94b80e 100644
--- a/eth/catalyst/simulated_beacon.go
+++ b/eth/catalyst/simulated_beacon.go
@@ -302,7 +302,7 @@ func (c *SimulatedBeacon) AdjustTime(adjustment time.Duration) error {
 		return errors.New("parent not found")
 	}
 	withdrawals := c.withdrawals.gatherPending(10)
-	return c.sealBlock(withdrawals, parent.Time+uint64(adjustment/1e9))
+	return c.sealBlock(withdrawals, parent.Time+uint64(adjustment/time.Second))
 }
 
 func RegisterSimulatedBeaconAPIs(stack *node.Node, sim *SimulatedBeacon) {