diff --git a/doc/source/ext/tablefromtext.py b/doc/source/ext/tablefromtext.py
index c99a7cd637..81480fdcbf 100644
--- a/doc/source/ext/tablefromtext.py
+++ b/doc/source/ext/tablefromtext.py
@@ -59,7 +59,9 @@ class TableFromText(Table):
         tgroup = nodes.tgroup(max_cols)
         table += tgroup
 
-        col_widths = self.get_column_widths(max_cols)[1]
+        col_widths = self.get_column_widths(max_cols)
+        if isinstance(col_widths, tuple):
+            col_widths = col_widths[1]
         tgroup.extend(nodes.colspec(colwidth=col_width) for
                       col_width in col_widths)