diff --git a/hack/verify-codegen.sh b/hack/verify-codegen.sh
index 645710ba28a..1d642f4c191 100755
--- a/hack/verify-codegen.sh
+++ b/hack/verify-codegen.sh
@@ -38,6 +38,7 @@ cp -aR "${REPO_ROOT_DIR}/Gopkg.lock" "${REPO_ROOT_DIR}/pkg" "${REPO_ROOT_DIR}/ve
 echo "Diffing ${REPO_ROOT_DIR} against freshly generated codegen"
 ret=0
 diff -Naupr "${REPO_ROOT_DIR}/pkg" "${TMP_DIFFROOT}/pkg" || ret=1
+diff -Naupr --no-dereference "${REPO_ROOT_DIR}/vendor" "${TMP_DIFFROOT}/vendor" || ret=1
 
 # Restore working tree state
 rm -fr "${REPO_ROOT_DIR}/Gopkg.lock" "${REPO_ROOT_DIR}/pkg" "${REPO_ROOT_DIR}/vendor"