diff --git a/apps/banglerun/log.js b/apps/banglerun/log.js
index ee2af3091..0cdeaa964 100644
--- a/apps/banglerun/log.js
+++ b/apps/banglerun/log.js
@@ -6,10 +6,7 @@ function initLog(state) {
     const date = datetime.substr(2, 6);
     const time = datetime.substr(9, 6);
     const filename = `banglerun_${date}_${time}`;
-    state = state;
-    state.file = require('Storage').open(filename, 'w');
-    state.fileWritten = false;
-    return state;
+    return Object.assign(Object.assign({}, state), { file: require('Storage').open(filename, 'w'), fileWritten: false });
 }
 exports.initLog = initLog;
 function updateLog(state) {
diff --git a/apps/banglerun/log.ts b/apps/banglerun/log.ts
index 282115e1a..ba1c1f00e 100644
--- a/apps/banglerun/log.ts
+++ b/apps/banglerun/log.ts
@@ -7,36 +7,41 @@ function initLog(state: AppState): AppStateWithLog {
   const date = datetime.substr(2, 6);
   const time = datetime.substr(9, 6);
   const filename = `banglerun_${date}_${time}`;
-  state = <AppStateWithLog> state;
-  state.file = require('Storage').open(filename, 'w');
-  state.fileWritten = false;
-  return state;
+  return {
+    ...state,
+    file: require('Storage').open(filename, 'w'),
+    fileWritten: false,
+  } as AppStateWithLog;
 }
 
 function updateLog(state: AppStateWithLog): void {
   if (!state.fileWritten) {
-    state.file.write([
-      'timestamp',
-      'latitude',
-      'longitude',
-      'altitude',
-      'duration',
-      'distance',
-      'heartrate',
-      'steps',
-    ].join(',') + '\n');
+    state.file.write(
+      [
+        'timestamp',
+        'latitude',
+        'longitude',
+        'altitude',
+        'duration',
+        'distance',
+        'heartrate',
+        'steps',
+      ].join(',') + '\n'
+    );
     state.fileWritten = true;
   }
-  state.file.write([
-    Date.now().toFixed(0),
-    state.lat.toFixed(6),
-    state.lon.toFixed(6),
-    state.alt.toFixed(2),
-    state.duration.toFixed(0),
-    state.distance.toFixed(2),
-    state.hr.toFixed(0),
-    state.steps.toFixed(0),
-  ].join(',') + '\n');
+  state.file.write(
+    [
+      Date.now().toFixed(0),
+      state.lat.toFixed(6),
+      state.lon.toFixed(6),
+      state.alt.toFixed(2),
+      state.duration.toFixed(0),
+      state.distance.toFixed(2),
+      state.hr.toFixed(0),
+      state.steps.toFixed(0),
+    ].join(',') + '\n'
+  );
 }
 
 export { initLog, updateLog };