diff --git a/scripts/_common.sh b/scripts/_common.sh
index 762a8e5..c156bb2 100644
--- a/scripts/_common.sh
+++ b/scripts/_common.sh
@@ -30,7 +30,7 @@ fi
 fabmanager_build_ruby() {
     pushd "$install_dir"
         ynh_use_ruby
-        ynh_exec_warn_less "$ynh_gem" install "bundler:$bundler_version"
+        ynh_exec_warn_less $ynh_gem install "bundler:$bundler_version"
         ynh_exec_warn_less bin/bundle config --global frozen 1
         ynh_exec_warn_less bin/bundle config set --local without 'development test doc'
         ynh_exec_warn_less bin/bundle install