diff --git a/src/model/covering.ts b/src/model/covering.ts
index b6d855f..77940b0 100644
--- a/src/model/covering.ts
+++ b/src/model/covering.ts
@@ -11,8 +11,8 @@ export class Covering {
     const ranges: GeohashRange[] = [];
     for (const outerRange of this.cellIds) {
       const hashRange = new GeohashRange(
-        outerRange.rangeMin().id as Long,
-        outerRange.rangeMax().id as Long,
+        outerRange.rangeMin().id,
+        outerRange.rangeMax().id,
       );
       ranges.push(...hashRange.trySplit(hashKeyLength));
     }
diff --git a/src/s2/s2-manager.ts b/src/s2/s2-manager.ts
index 1e4aac1..0c27f0d 100644
--- a/src/s2/s2-manager.ts
+++ b/src/s2/s2-manager.ts
@@ -21,7 +21,7 @@ export const generateGeohash = (geoPoint: GeoPoint): Long => {
   const latLng = S2LatLng.fromDegrees(geoPoint.latitude, geoPoint.longitude);
   const cell = S2Cell.fromLatLng(latLng);
   const cellId = cell.id;
-  return cellId.id as Long;
+  return cellId.id;
 };
 
 export const generateHashKey = (geohash: Long, hashKeyLength: number): Long => {