diff --git a/core/core-frontend/src/views/chart/components/js/panel/common/common_antv.ts b/core/core-frontend/src/views/chart/components/js/panel/common/common_antv.ts
index 312a7a824d..fae27788cf 100644
--- a/core/core-frontend/src/views/chart/components/js/panel/common/common_antv.ts
+++ b/core/core-frontend/src/views/chart/components/js/panel/common/common_antv.ts
@@ -147,9 +147,7 @@ export function getTheme(chart: Chart) {
     }
   }
   if (chart.fontFamily) {
-    theme.styleSheet = {
-      fontFamily: chart.fontFamily
-    }
+    theme.styleSheet.fontFamily = chart.fontFamily
   }
   return theme
 }