diff --git a/lib/filesystem.js b/lib/filesystem.js
index 35df0be..fbe31fa 100644
--- a/lib/filesystem.js
+++ b/lib/filesystem.js
@@ -132,7 +132,7 @@ function fsSize(callback) {
         }
         if (_linux) {
           cmd = 'df -lkPTx squashfs';
-          execSync('cat /proc/mounts').toString().split('\n').filter(line => {
+          execSync('cat /proc/mounts 2>/dev/null').toString().split('\n').filter(line => {
             return line.startsWith('/');
           }).forEach((line) => {
             osMounts[line.split(' ')[0]] = line.toLowerCase().indexOf('rw') >= 0;