diff --git a/src/storage/filesystem.js b/src/storage/filesystem.js
index 5d5d414e0..e959a189e 100644
--- a/src/storage/filesystem.js
+++ b/src/storage/filesystem.js
@@ -284,8 +284,7 @@ function testConfig(apiConfig, callback) {
     }
 
     if (apiConfig.provider === PROVIDER_MOUNTPOINT) {
-        safe.child_process.execSync(`mountpoint -q -- ${apiConfig.mountPoint}`, { encoding: 'utf8' });
-        if (safe.error) return callback(new BoxError(BoxError.BAD_FIELD, `${apiConfig.mountPoint} is not mounted`, { field: 'mountPoint' }));
+        if (!safe.child_process.execSync(`mountpoint -q -- ${apiConfig.mountPoint}`)) return callback(new BoxError(BoxError.BAD_FIELD, `${apiConfig.mountPoint} is not mounted`, { field: 'mountPoint' }));
     }
 
     const backupPath = getBackupPath(apiConfig);