diff --git a/Documentation/sphinx/rstFlatTable.py b/Documentation/sphinx/rstFlatTable.py
index 55f2757..25feb0d 100755
--- a/Documentation/sphinx/rstFlatTable.py
+++ b/Documentation/sphinx/rstFlatTable.py
@@ -157,6 +157,11 @@
     def buildTableNode(self):
 
         colwidths    = self.directive.get_column_widths(self.max_cols)
+        if isinstance(colwidths, tuple):
+            # Since docutils 0.13, get_column_widths returns a (widths,
+            # colwidths) tuple, where widths is a string (i.e. 'auto').
+            # See https://sourceforge.net/p/docutils/patches/120/.
+            colwidths = colwidths[1]
         stub_columns = self.directive.options.get('stub-columns', 0)
         header_rows  = self.directive.options.get('header-rows', 0)