diff --git a/docs/build.py b/docs/build.py
index d69cc32e6..769917397 100755
--- a/docs/build.py
+++ b/docs/build.py
@@ -60,6 +60,7 @@ cmd("cd ../scripts && doxygen Doxyfile")
 cmd("sphinx-build -b latex . out_latex")
 
 # Generate PDF
+cmd("cd out_latex && makeindex LVGL.idx")
 cmd("cd out_latex && makeindex -s python.ist  -o LVGL.ind LVGL.idx")
 cmd("cd out_latex && xelatex -interaction=batchmode *.tex")
 # Copy the result PDF to the main directory to make it avaiable for the HTML build