diff --git a/core/core-frontend/src/views/chart/components/js/panel/charts/map/flow-map.ts b/core/core-frontend/src/views/chart/components/js/panel/charts/map/flow-map.ts
index 9ef53a7bae..07d8ebb3f6 100644
--- a/core/core-frontend/src/views/chart/components/js/panel/charts/map/flow-map.ts
+++ b/core/core-frontend/src/views/chart/components/js/panel/charts/map/flow-map.ts
@@ -57,7 +57,7 @@ export class FlowMap extends L7ChartView<Scene, L7Config> {
     }
     const flowLineStyle = {
       type: miscStyle.mapLineType,
-      size: miscStyle.mapLineWidth,
+      size: miscStyle.mapLineType === 'line' ? miscStyle.mapLineWidth / 2 : miscStyle.mapLineWidth,
       animate: miscStyle.mapLineAnimate,
       animateDuration: miscStyle.mapLineAnimateDuration,
       gradient: miscStyle.mapLineGradient,