diff --git a/python-hdfs.spec b/python-hdfs.spec
index 7c19df8..908f854 100644
--- a/python-hdfs.spec
+++ b/python-hdfs.spec
@@ -150,7 +150,7 @@ It also includes the avro-specific command-line tool, hdfscli-avro.
 %pyproject_wheel
 
 %if %{with doc_pdf}
-PYTHONPATH="${PWD}" sphinx-build -b latex doc _latex %{?_smp_mflags}
+PYTHONPATH="${PWD}" sphinx-build -b latex doc _latex -j%{?_smp_build_ncpus}
 %make_build -C _latex
 %endif