diff --git a/types/ngeohash/index.d.ts b/types/ngeohash/index.d.ts
index 25c8f29e5b..af498162ce 100644
--- a/types/ngeohash/index.d.ts
+++ b/types/ngeohash/index.d.ts
@@ -12,7 +12,7 @@ declare namespace ngeohash {
   type GeographicBoundingBox = [number, number, number, number];
   type NSEW = [number, number];
 
-  function encode(latitude: number, longitude: number, precision?: number): string;
+  function encode(latitude: number|string, longitude: number|string, precision?: number): string;
   function decode(hashstring: string): GeographicPoint;
   function decode_bbox(hashstring: string): GeographicBoundingBox;
   function bboxes(minlat: number, minlon: number, maxlat: number, maxlon: number, precision?: number): Array<string>;
diff --git a/types/ngeohash/ngeohash-tests.ts b/types/ngeohash/ngeohash-tests.ts
index 34ad34d7cf..5c77ae94df 100644
--- a/types/ngeohash/ngeohash-tests.ts
+++ b/types/ngeohash/ngeohash-tests.ts
@@ -1,6 +1,7 @@
 import geohash = require('ngeohash');
 
 console.log(geohash.encode(37.8324, 112.5584));
+console.log(geohash.encode('37.8324', '112.5584'));
 // prints ww8p1r4t8
 
 var latlon = geohash.decode('ww8p1r4t8');