diff --git a/src/lib/store/ship.js b/src/lib/store/ship.js
index 2e507f1..d86f1ed 100644
--- a/src/lib/store/ship.js
+++ b/src/lib/store/ship.js
@@ -1,4 +1,4 @@
-import { browser } from "$app/env";
+import { browser, dev } from "$app/env";
 import { readable, get, derived } from "svelte/store";
 import { compose, applyMiddleware } from "redux";
 
@@ -6,27 +6,27 @@ import shipDux from "../shipDux/index.js";
 
 let composeEnhancers = compose;
 
-if (browser) {
-  composeEnhancers = window.__REDUX_DEVTOOLS_EXTENSION_COMPOSE__;
+if (dev && browser && window.__REDUX_DEVTOOLS_EXTENSION_COMPOSE__) {
+    composeEnhancers = window.__REDUX_DEVTOOLS_EXTENSION_COMPOSE__;
 }
 
 export default () => {
-  const duxStore = shipDux.createStore(undefined, (mw) =>
-    composeEnhancers(applyMiddleware(mw))
-  );
+    const duxStore = shipDux.createStore(undefined, (mw) =>
+        composeEnhancers(applyMiddleware(mw))
+    );
 
-  let previous;
-  const state = readable(duxStore.getState(), (set) => {
-    duxStore.subscribe(() => {
-      if (previous === duxStore.getState()) return;
-      previous = duxStore.getState();
-      set(previous);
+    let previous;
+    const state = readable(duxStore.getState(), (set) => {
+        duxStore.subscribe(() => {
+            if (previous === duxStore.getState()) return;
+            previous = duxStore.getState();
+            set(previous);
+        });
     });
-  });
 
-  return {
-    dispatch: duxStore.dispatch,
-    state,
-    shipMass: derived( state, state => state.reqs.mass )
-  };
+    return {
+        dispatch: duxStore.dispatch,
+        state,
+        shipMass: derived(state, (state) => state.reqs.mass),
+    };
 };