diff --git a/mold.spec b/mold.spec
index 00dc62b..e17b391 100644
--- a/mold.spec
+++ b/mold.spec
@@ -102,7 +102,7 @@ fi
 %if 0%{?el8}
 . /opt/rh/gcc-toolset-10/enable
 %endif
-%make_build %{build_args} test
+%make_build -j1 %{build_args} test
 
 %files
 %license LICENSE