diff --git a/lib/mbtiles.js b/lib/mbtiles.js
index c29365c..8f66868 100644
--- a/lib/mbtiles.js
+++ b/lib/mbtiles.js
@@ -233,7 +233,7 @@ MBTiles.prototype.grid = function(x, y, z, callback) {
             if (!row || !row.grid) return callback('Grid does not exist');
             var grid = zlib.inflate(
                     !Buffer.isBuffer(row.grid)
-                    ? new Buffer(grid, 'binary')
+                    ? new Buffer(row.grid, 'binary')
                     : row.grid
                 ).toString();
             var data = rows.reduce(function(memo, r) {