diff --git a/doc/CMakeLists.txt b/doc/CMakeLists.txt
index f4e9deb0..2990e8fc 100644
--- a/doc/CMakeLists.txt
+++ b/doc/CMakeLists.txt
@@ -4,12 +4,6 @@ if (NOT DOXYGEN)
   return ()
 endif ()
 
-add_custom_command(OUTPUT html/_static/cppformat.css
-  COMMAND lessc --clean-css --include-path=${CMAKE_CURRENT_SOURCE_DIR}/bootstrap
-                ${CMAKE_CURRENT_SOURCE_DIR}/cppformat.less html/_static/cppformat.css
-  DEPENDS cppformat.less)
-
-add_custom_target(doc COMMAND ${CMAKE_CURRENT_SOURCE_DIR}/build.py
-  DEPENDS ${CMAKE_CURRENT_BINARY_DIR}/html/_static/cppformat.css)
+add_custom_target(doc COMMAND ${CMAKE_CURRENT_SOURCE_DIR}/build.py)
 
 install(DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}/html/ DESTINATION share/doc/cppformat)
diff --git a/doc/build.py b/doc/build.py
index d947f337..f294f22f 100755
--- a/doc/build.py
+++ b/doc/build.py
@@ -58,8 +58,8 @@ def build_docs():
     raise CalledProcessError(p.returncode, cmd)
   check_call(['sphinx-build', '-D', 'breathe_projects.format=doxyxml',
               '-b', 'html', doc_dir, 'html'])
-  #check_call(['lessc', '--clean-css', '--include-path=bootstrap', 'cppformat.less',
-  #            'html/_static/cppformat.css'], cwd=doc_dir)
+  check_call(['lessc', '--clean-css', '--include-path=' + os.path.join(doc_dir, 'bootstrap'),
+              os.path.join(doc_dir, 'cppformat.less'), 'html/_static/cppformat.css'])
   return 'html'
 
 if __name__ == '__main__':