diff --git a/lib/filesystem.js b/lib/filesystem.js
index 3717b90..b84baf9 100644
--- a/lib/filesystem.js
+++ b/lib/filesystem.js
@@ -137,7 +137,7 @@ function fsSize(drive, callback) {
           }
         }
         if (_linux) {
-          cmd = 'df -lkPTx squashfs';
+          cmd = 'export LC_ALL=C; df -lkPTx squashfs; unset LC_ALL';
           execSync('cat /proc/mounts 2>/dev/null').toString().split('\n').filter(line => {
             return line.startsWith('/');
           }).forEach((line) => {
@@ -158,7 +158,7 @@ function fsSize(drive, callback) {
               return item.fs.toLowerCase().indexOf(drive.toLowerCase()) >= 0 || item.mount.toLowerCase().indexOf(drive.toLowerCase()) >= 0;
             });
           }
-          if (!error || data.length) {
+          if ((!error || data.length) && stdout.toString().toLowerCase().indexOf('unrecognized option') === -1) {
             if (callback) {
               callback(data);
             }