diff --git a/docs/Makefile b/docs/Makefile
index 852d95b4c6..300ba13fc5 100644
--- a/docs/Makefile
+++ b/docs/Makefile
@@ -3,7 +3,7 @@
 
 # You can set these variables from the command line.
 SPHINXOPTS    =
-SPHINXBUILD   = python -msphinx
+SPHINXBUILD   = python3 -msphinx
 SPHINXPROJ    = ShakaPackager
 SOURCEDIR     = source
 BUILDDIR      = ../out/sphinx