diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 09dfa08..83e13f0 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -28,6 +28,9 @@ jobs:
       - uses: j178/prek-action@v3.0.0
         with:
           extra-args: --all-files
+        env:
+          # Not a real commit -- no-commit-to-branch would always fail here.
+          SKIP: no-commit-to-branch
 
   checks:
     name: Check Python ${{ matrix.python-version }} on ${{ matrix.runs-on }}
diff --git a/noxfile.py b/noxfile.py
index aed41d2..328eca2 100644
--- a/noxfile.py
+++ b/noxfile.py
@@ -1,6 +1,7 @@
 """Nox configuration."""
 
 import argparse
+import os
 import shutil
 from pathlib import Path
 
@@ -17,12 +18,16 @@
 def lint(session: nox.Session) -> None:
     """Run the linter."""
     session.install("prek")
+    # Not a real commit -- no-commit-to-branch would always fail here.
+    # Merge into any SKIP already set, rather than clobber it.
+    skip = ",".join(filter(None, [os.environ.get("SKIP"), "no-commit-to-branch"]))
     session.run(
         "prek",
         "run",
         "--all-files",
         "--show-diff-on-failure",
         *session.posargs,
+        env={"SKIP": skip},
     )