diff --git a/package.json b/package.json
index 12999738..c4b8aae5 100644
--- a/package.json
+++ b/package.json
@@ -88,7 +88,7 @@
   },
   "dependencies": {
     "babel-polyfill": "*",
-    "browserify-zlib": "ipfs/browserify-zlib",
+    "browserify-zlib-next": "^1.0.1",
     "classnames": "^2.2.5",
     "coriolis-data": "EDCD/coriolis-data",
     "d3": "4.8.0",
diff --git a/src/app/shipyard/Ship.js b/src/app/shipyard/Ship.js
index 421504f5..d3855cc8 100755
--- a/src/app/shipyard/Ship.js
+++ b/src/app/shipyard/Ship.js
@@ -1486,8 +1486,8 @@ export default class Ship {
     let bufsize = 0;
     for (let i = 0; i < slots.length; i++) {
       if (slots[i].length > 0 || (blueprints[i] && blueprints[i].id)) {
-        // Length is 1 for the slot ID, 5 for each modification, and 1 for the end marker
-        bufsize = bufsize + 1 + (5 * slots[i].length) + 1;
+        // Length is 1 for the slot ID, 5 for each modification, 1 for the end marker of the modifications and 1 for the end marker of the slot
+        bufsize = bufsize + 1 + (5 * slots[i].length) + 1 + 1;
 
         if (blueprints[i] && blueprints[i].id) {
           // Additional 10 for the blueprint and grade