diff --git a/src/storage/filesystem.js b/src/storage/filesystem.js
index 960b54a2b..d5b044721 100644
--- a/src/storage/filesystem.js
+++ b/src/storage/filesystem.js
@@ -260,8 +260,10 @@ function testConfig(apiConfig, callback) {
         if (error) return callback(error);
 
         if (typeof apiConfig.prefix !== 'string') return callback(new BoxError(BoxError.BAD_FIELD, 'prefix must be a string', { field: 'prefix' }));
-        if (path.isAbsolute(apiConfig.prefix)) return new BoxError(BoxError.BAD_FIELD, 'prefix must be a relative path', { field: 'backupFolder' });
-        if (path.normalize(apiConfig.prefix) !== apiConfig.prefix) return callback(new BoxError(BoxError.BAD_FIELD, 'prefix must contain a normalized relative path', { field: 'prefix' }));
+        if (apiConfig.prefix !== '') {
+            if (path.isAbsolute(apiConfig.prefix)) return new BoxError(BoxError.BAD_FIELD, 'prefix must be a relative path', { field: 'backupFolder' });
+            if (path.normalize(apiConfig.prefix) !== apiConfig.prefix) return callback(new BoxError(BoxError.BAD_FIELD, 'prefix must contain a normalized relative path', { field: 'prefix' }));
+        }
 
         const mounts = safe.fs.readFileSync('/proc/mounts', 'utf8');
         const mountInfo = mounts.split('\n').filter(function (l) { return l.indexOf(apiConfig.mountPoint) !== -1; })[0];