diff --git a/sympy.spec b/sympy.spec
index 3650009..a03c1d3 100644
--- a/sympy.spec
+++ b/sympy.spec
@@ -151,7 +151,7 @@ popd
 # Build the documentation
 pushd %{sympydir}/doc
 sed -i 's/sphinx-build/&-%{python3_version}/' Makefile
-make html SPHINXOPTS=%{?_smp_mflags}
+make html SPHINXOPTS=%{?_smp_mflags} PYTHON=%{__python3}
 make cheatsheet
 popd
 pushd python3/doc