diff --git a/composer-action.bash b/composer-action.bash
index 1ccbef7..b61a22f 100755
--- a/composer-action.bash
+++ b/composer-action.bash
@@ -196,7 +196,7 @@ do
 	fi
 done <<<$(env)
 
-if [ -z "$ACTION_CONTAINER_WORKDIR" ]; then
+if [ -n "$ACTION_CONTAINER_WORKDIR" ]; then
 	container_workdir="${ACTION_CONTAINER_WORKDIR}"
 fi