diff --git a/.github/workflows/presubmit.yml b/.github/workflows/presubmit.yml
index cddc2e9b..a2c6845d 100644
--- a/.github/workflows/presubmit.yml
+++ b/.github/workflows/presubmit.yml
@@ -54,11 +54,11 @@ jobs:
 
       - name: Generate core specs (HTML and PDF)
         run: |
-          python3 makeSpec -clean -spec core OUTDIR=out.core -j -O api c env ext cxx4opencl
+          python3 makeSpec -clean -spec core OUTDIR=out.core -j 5 -O api c env ext cxx4opencl
 
       - name: Generate core + extension specs (HTML)
         run: |
-          python3 makeSpec -clean -spec khr OUTDIR=out.khr QUIET= -j -O html
+          python3 makeSpec -clean -spec khr OUTDIR=out.khr -j -O html
 
       - name: Generate reference pages
         run: |