diff --git a/scripts/generate b/scripts/generate
index 17ee505..7d0c6c4 100755
--- a/scripts/generate
+++ b/scripts/generate
@@ -7,4 +7,4 @@ set -ue
 # realpath's `-m` is required, since the path might not exist.
 ENV_DIR=$(realpath -m "environments/$ARGOCD_ENV_TK_ENV")
 
-tk show "$ENV_DIR" --dangerous-allow-redirect ${ARGOCD_ENV_EXTRA_ARGS}
+tk show "$ENV_DIR" --dangerous-allow-redirect ${ARGOCD_ENV_EXTRA_ARGS:-}