diff --git a/sympy.spec b/sympy.spec
index 6810dc5..b65de00 100644
--- a/sympy.spec
+++ b/sympy.spec
@@ -148,7 +148,7 @@ popd
 
 # Build the documentation
 pushd %{sympydir}/doc
-make html
+make html SPHINXOPTS=%{?_smp_mflags}
 make cheatsheet
 popd
 pushd python3/doc