diff --git a/src/components/mapart/greenButtons.js b/src/components/mapart/greenButtons.js
index 8ba1c6b..81d01d0 100644
--- a/src/components/mapart/greenButtons.js
+++ b/src/components/mapart/greenButtons.js
@@ -113,8 +113,8 @@ class GreenButtons extends Component {
           console.log(`Created Mapdat by ${(t1 - t0).toString()}ms`);
           numberOfSplitsCalculated++;
           const { Mapdat_Bytes, whichMap_x, whichMap_y } = e.data.body;
-          const NBT_Array_gzipped = gzip(NBT_Array);
-          const downloadBlob = new Blob([NBT_Array_gzipped], { type: "application/x-minecraft-level" });
+          const Mapdat_Bytes_gzipped = gzip(Mapdat_Bytes);
+          const downloadBlob = new Blob([Mapdat_Bytes_gzipped], { type: "application/x-minecraft-level" });
           downloadBlobFile(downloadBlob, optionValue_mapdatFilenameUseId
             ? `map_${(optionValue_mapdatFilenameIdStart + whichMap_y * optionValue_mapSize_x + whichMap_x).toString()}.dat`
             : `${uploadedImage_baseFilename}_${whichMap_x.toString()}_${whichMap_y.toString()}.dat`);