diff --git a/python-fasteners.spec b/python-fasteners.spec
index af9f402..37a4844 100644
--- a/python-fasteners.spec
+++ b/python-fasteners.spec
@@ -68,7 +68,8 @@ sed -r -i '/\b(diskcache)\b/d' requirements-test.txt
 %pyproject_wheel
 
 %if %{with doc_pdf}
-PYTHONPATH="${PWD}" sphinx-build -b latex doc/source %{_vpath_builddir}/_latex
+PYTHONPATH="${PWD}" \
+    sphinx-build -b latex %{?_smp_mflags} doc/source %{_vpath_builddir}/_latex
 %make_build -C %{_vpath_builddir}/_latex LATEXMKOPTS='-quiet'
 %endif