diff --git a/drivers/ISOSR.py b/drivers/ISOSR.py
index 4bfd37435..cc7569758 100755
--- a/drivers/ISOSR.py
+++ b/drivers/ISOSR.py
@@ -284,6 +284,7 @@ def appendCIFSMountOptions(self, mountcmd):
         try:
             options.append(self.getCIFSPasswordOptions())
             options.append(self.getCacheOptions())
+            options.append('guest')
         except:
             util.SMlog("Exception while attempting to append mount options")
             raise
diff --git a/drivers/SMBSR.py b/drivers/SMBSR.py
index 7a7c98d9b..475c359d3 100755
--- a/drivers/SMBSR.py
+++ b/drivers/SMBSR.py
@@ -129,7 +129,8 @@ def mount(self, mountpoint=None):
                 'sec=ntlm',
                 'cache=none',
                 'vers=3.0',
-                'credentials=%s' % self.credentials
+                'credentials=%s' % self.credentials,
+                'guest'
         ])
 
         dom_username = self.dconf['username'].split('\\')