diff --git a/src/util/types.ts b/src/util/types.ts
index 00d3b826c6..1d11e52a92 100644
--- a/src/util/types.ts
+++ b/src/util/types.ts
@@ -1264,7 +1264,7 @@ export interface TooltipPositionCallback {
              */
             viewSize: [number, number]
         }
-    ): number[] | string[] | TooltipBuiltinPosition | TooltipBoxLayoutOption
+    ): Array<number | string> | TooltipBuiltinPosition | TooltipBoxLayoutOption
 }
 /**
  * Common tooltip option