diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index 3659d0d163..1c835485a5 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -235,11 +235,11 @@ jobs:
           touch /private/tmp/roundtrip.u
           touch /private/tmp/rewrite-tmp.u
           stack --no-terminal exec unison transcript unison-src/transcripts-round-trip/main.md
-          git add unison-src/transcripts-round-trip/main.output.md 
+          git add unison-src/transcripts-round-trip/main.output.md
           # Fail if any transcripts cause git diffs.
           git diff --cached --ignore-cr-at-eol --exit-code
           stack --no-terminal exec unison transcript unison-src/transcripts-manual/rewrites.md
-          git add unison-src/transcripts-manual/rewrites.output.md 
+          git add unison-src/transcripts-manual/rewrites.output.md
           # Fail if any transcripts cause git diffs.
           git diff --cached --ignore-cr-at-eol --exit-code
       - name: transcripts
@@ -314,6 +314,9 @@ jobs:
             exit 1
           fi
 
+      - name: verify stack ghci startup
+        if: runner.os == 'macOS'
+        run: echo | stack ghci
       - name: check final stackage cache size
         run: |
           echo global .stack