diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index da30ca64..d278ad17 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -256,8 +256,8 @@ jobs:
           COVERITY_SCAN_TOKEN: ${{ secrets.COVERITY_SCAN_TOKEN }}
 
       - name: Prepare for cache
-        if: ${{ env.BOOST_ROOT != '' }}
-        run: rm -rf boost-root; mv "${BOOST_ROOT}" boost-root
+        if: ${{ env.BOOST_ROOT_CACHE != '' }}
+        run: rm -rf boost-root; mv "${BOOST_ROOT_CACHE}" boost-root
         working-directory: ${{github.workspace}}
   windows:
     defaults:
diff --git a/ci/github/install.sh b/ci/github/install.sh
index c45cc798..60049679 100644
--- a/ci/github/install.sh
+++ b/ci/github/install.sh
@@ -33,6 +33,11 @@ fi
 
 . $(dirname "${BASH_SOURCE[0]}")/../common_install.sh
 
+# Save the state before building anything to avoid caching build artefacts
+BOOST_ROOT_CACHE="${BOOST_ROOT}-for-cache"
+echo "BOOST_ROOT_CACHE=$BOOST_ROOT_CACHE" >> $GITHUB_ENV
+cp -r "$BOOST_ROOT" "$BOOST_ROOT_CACHE"
+
 # Persist the environment for all future steps
 
 # Set by common_install.sh