diff --git a/setup/scripts/l3d b/setup/scripts/l3d
index e58c0ba5f6952e869a92db4ffedeccda0680f183..2ec918c87af5af63973b62efb83bb9cd83e15931 100755
--- a/setup/scripts/l3d
+++ b/setup/scripts/l3d
@@ -24,7 +24,7 @@ esac
 
 mkdir -p ${HOME}/.composer
 touch ${HOME}/.composer/auth.json
-if [[ -s "${HOME}/.composer/auth.json" ]]; then
+if [[ ! -s "${HOME}/.composer/auth.json" ]]; then
   echo "{}" > ${HOME}/.composer/auth.json
 fi
 touch ${HOME}/.gitconfig