diff --git a/.forgejo/workflows/ci.yml b/.forgejo/workflows/ci.yml
index e3825bc..3dc65bc 100644
--- a/.forgejo/workflows/ci.yml
+++ b/.forgejo/workflows/ci.yml
@@ -326,10 +326,10 @@ jobs:
           echo "value=$TAGS" >> $GITHUB_OUTPUT
           echo "build_version=$BUILD_VERSION" >> $GITHUB_OUTPUT
 
-      - name: Free disk space
-        run: |
-          docker system prune -af || true
-          docker builder prune --keep-storage 5g -f || true
+      # No disk-space prune step: the runner's Docker daemon is shared, and
+      # `docker system prune -af` here deleted images other repos' jobs had
+      # just pulled and were about to start (CI-runner #16). The runner host
+      # prunes nightly instead.
 
       # Bake EVERY client in, on every image build, so a self-hoster gets a working
       # app for their machine from the server holding their notes, with no trip to a