diff --git a/ci/lint/06_script.sh b/ci/lint/06_script.sh
index 6761c0c86f..52d434afef 100755
--- a/ci/lint/06_script.sh
+++ b/ci/lint/06_script.sh
@@ -17,6 +17,7 @@ export COMMIT_RANGE
 # check with -r to not have to fetch all the remotes.
 test/lint/git-subtree-check.sh src/crypto/ctaes
 test/lint/git-subtree-check.sh src/secp256k1
+test/lint/git-subtree-check.sh src/simplicity
 test/lint/git-subtree-check.sh src/minisketch
 test/lint/git-subtree-check.sh src/univalue
 test/lint/git-subtree-check.sh src/leveldb