diff --git a/.github/workflows/f5c-x86_64.yml b/.github/workflows/f5c-x86_64.yml
index 7c831f6a..40a5ba5f 100644
--- a/.github/workflows/f5c-x86_64.yml
+++ b/.github/workflows/f5c-x86_64.yml
@@ -160,7 +160,7 @@ jobs:
     - name: install packages
       run: brew install hdf5 autoconf automake
     - name: build
-      run: autoreconf --install && ./scripts/install-hts.sh && ./configure --disable-hdf5
+      run: autoreconf --install && ./scripts/install-hts.sh && ./configure --disable-hdf5  && make -j8
     - name: test
       run: test/test_slow5.sh
   ubuntu_arm: