diff --git a/news/109.bugfix b/news/109.bugfix
new file mode 100644
index 00000000..a7f6796f
--- /dev/null
+++ b/news/109.bugfix
@@ -0,0 +1 @@
+Ensure that, when no timezone is selected, the value of the stored timezone is an empty string
diff --git a/plone/app/users/browser/account.py b/plone/app/users/browser/account.py
index f89bac92..f13c085c 100644
--- a/plone/app/users/browser/account.py
+++ b/plone/app/users/browser/account.py
@@ -138,6 +138,16 @@ def wysiwyg_editor(self, value):
             value = ''
         return self._setProperty('wysiwyg_editor', value)
 
+    @property
+    def timezone(self):
+        return self._getProperty('timezone')
+
+    @timezone.setter
+    def timezone(self, value):
+        if value is None:
+            value = ''
+        return self._setProperty('timezone', value)
+
 
 @implementer(IAccountPanelForm)
 class AccountPanelForm(AutoExtensibleForm, form.Form):