diff --git a/core/output.py b/core/output.py
index c372586..af2b535 100644
--- a/core/output.py
+++ b/core/output.py
@@ -48,6 +48,7 @@ class i3(object):
                 'color': self._theme.fg(widget),
                 'background': self._theme.bg(widget),
                 'separator': self._theme.default_separators(),
+                'separator_block_width': self._theme.separator_block_width(),
             })
             core.event.trigger('next-widget')
         return widgets
diff --git a/core/theme.py b/core/theme.py
index 36f3cc3..473f11b 100644
--- a/core/theme.py
+++ b/core/theme.py
@@ -39,6 +39,9 @@ class Theme(object):
     def default_separators(self, widget=None):
         return self.__get(widget, 'default-separators', True)
 
+    def separator_block_width(self, widget=None):
+        return self.__get(widget, 'separator-block-width', 0)
+
     def __start(self):
         self.__widget_count = 0