diff --git a/run-eclair-builds.sh b/run-eclair-builds.sh
index 3ed9e7f..fd464b5 100755
--- a/run-eclair-builds.sh
+++ b/run-eclair-builds.sh
@@ -19,6 +19,7 @@
     (cd mbedtls; git checkout-index -faq; git clean -fdq)
     (cd psa-arch-tests; git checkout-index -faq; git clean -fdq)
     (cd trusted-firmware-m; git checkout-index -faq; git clean -fdq)
+    (cd t_cose; git checkout-index -faq; git clean -fdq)
     eclair_tfm_set_toolchain_path
     detachLicense $LICENSE_LEASE
     tf-m-ci-scripts/run-build.sh