diff --git a/plugin.sh b/plugin.sh
index 95839a8..1131da9 100755
--- a/plugin.sh
+++ b/plugin.sh
@@ -64,8 +64,7 @@ if [[ "${PLUGIN_SKIP_UNUSED_STAGES:-}" == "true" ]]; then
     SKIP_UNUSED_STAGES="--skip-unused-stages=true"
 fi
 
-# full, redo, time
-if [ -n "${PLUGIN_SNAPSHOT_MODE:-}" ]; then
+if [[ -n "${PLUGIN_SNAPSHOT_MODE:-}" ]]; then
     SNAPSHOT_MODE="--snapshot-mode=${PLUGIN_SNAPSHOT_MODE}"
 fi