diff --git a/doc/CMakeLists.txt b/doc/CMakeLists.txt
index e0487c6f..ded0d58c 100644
--- a/doc/CMakeLists.txt
+++ b/doc/CMakeLists.txt
@@ -1,6 +1,6 @@
 add_custom_command(OUTPUT html/index.html
   COMMAND doxygen
   COMMAND rm -rf html
-  COMMAND ../sphinx/sphinx-build.py -b html . html
+  COMMAND sphinx-build -b html . html
   DEPENDS ../format.h Doxyfile conf.py index.rst _templates/layout.html)
 add_custom_target(doc DEPENDS html/index.html)