diff --git a/.github/workflows/pvs_prelude.yml b/.github/workflows/pvs_prelude.yml
index 3cc87a073f8e687c4e138682b794876309ba31d2..bab941ebe75ea07b20dec55613f0a0338ed4eda5 100644
--- a/.github/workflows/pvs_prelude.yml
+++ b/.github/workflows/pvs_prelude.yml
@@ -8,26 +8,28 @@ jobs:
 
     steps:
     - uses: actions/checkout@v2
+      with:
+        path: personoj
 
     - name: setup
-      run: tools/bootstrap.sh
+      run: ${GITHUB_WORKSPACE}/personoj/tools/bootstrap.sh
       shell: sh
 
     - name: install personoj
       run: |
         eval $(opam env --switch=~/lambdapi --set-switch)
-        bmake -C encoding install
-        cp 'tools/load-personoj.lisp' > ~/.pvs.lisp
+        bmake -C "${GITHUB_WORKSPACE}"/personoj/encoding install
+        cp "${GITHUB_WORKSPACE}/personoj/tools/load-personoj.lisp" ~/.pvs.lisp
         echo '(load-personoj)' >> ~/.pvs.lisp
-        cat ~/.pvs.lisp
 
     - name: translate and typecheck
       run: |
         eval $(opam env --switch=~/lambdapi --set-switch)
-        cd specs/tools/prelude || exit 1
+        cd "${GITHUB_WORKSPACE}"/personoj/specs/tools/prelude || exit 1
         # Comment out theories that consume too much memory during 
         # typechecking
         sed -i 's/^floor_ceil$/-floor_ceil/' theories
         sed -i 's/^modulo_arithmetic$/-modulo_arithmetic/' theories
         sed -i 's/^mod$/-mod/' theories
-        bmake PVSPATH=~/PVS # Set in bootstrap.sh
+        PERSONOJPATH="${GITHUB_WORKSPACE}"/personoj/
+        bmake PERSONOJPATH="${PERSONOJPATH}" PVSPATH=~/PVS
diff --git a/tools/bootstrap.sh b/tools/bootstrap.sh
index f21a423c27cd72dad25c08694bd8d1c8d9cfcf03..0e48e6803dc710a88961a5e1828029d0477475ab 100755
--- a/tools/bootstrap.sh
+++ b/tools/bootstrap.sh
@@ -1,6 +1,10 @@
 #!/bin/sh
 set -eu
 
+SCRIPT=$(realpath "$0")
+DIR=$(dirname "$SCRIPT")
+ROOT=$(realpath "${DIR}/..") # Root of personoj repo
+
 curl -s 'http://www.lsv.fr/~hondet/pvs/lambdapi-pvs_1.0_all.deb' > lambdapi-pvs.deb 
 yes | sudo apt-get -q install ./lambdapi-pvs.deb
 yes | sudo apt-get install -q emacs # For PVS
@@ -39,7 +43,7 @@ gclone https://github.com/SRI-CSL/PVS.git PVS pvs7.1
  PVSPATH="${HOME}/PVS"
  export PVSPATH
 
- for p in $(find specs/tools/prelude_patches -name '*.diff' | sort); do
+ for p in $(find "${ROOT}"/specs/tools/prelude_patches -name '*.diff' | sort); do
      patch "${PVSPATH}/lib/prelude.pvs" "$p"
  done