diff --git a/gap_nrf528xx-central.go b/gap_nrf528xx-central.go
index a0c8db7..2ae2c81 100644
--- a/gap_nrf528xx-central.go
+++ b/gap_nrf528xx-central.go
@@ -87,10 +87,8 @@ func (a *Adapter) StopScan() error {
 		return errNotScanning
 	}
 	a.scanning = false
-
-	// TODO: stop immediately, not when the next scan result arrives.
-
-	return nil
+	errCode := C.sd_ble_gap_scan_stop()
+	return makeError(errCode)
 }
 
 // In-progress connection attempt.