diff --git a/Utilities/Sphinx/cmake.py b/Utilities/Sphinx/cmake.py
index 1955e4295..336c74aa3 100644
--- a/Utilities/Sphinx/cmake.py
+++ b/Utilities/Sphinx/cmake.py
@@ -12,6 +12,16 @@
 import os
 import re
 
+# Monkey patch for pygments reporting an error when generator expressions are
+# used.
+# https://bitbucket.org/birkenfeld/pygments-main/issue/942/cmake-generator-expressions-not-handled
+from pygments.lexers import CMakeLexer
+from pygments.token import Name, Operator
+from pygments.lexer import bygroups
+CMakeLexer.tokens["args"].append(('(\\$<)(.+?)(>)',
+                                  bygroups(Operator, Name.Variable, Operator)))
+
+
 from docutils.parsers.rst import Directive, directives
 from docutils.transforms import Transform
 try: