diff --git a/scripts/install b/scripts/install
index f86ee2a..6862964 100644
--- a/scripts/install
+++ b/scripts/install
@@ -129,12 +129,12 @@ ynh_script_progression --message="Building $app... (this will take some time and
 pushd "$final_path" || ynh_die
 
 	ynh_use_nodejs
-	yarn install --non-interactive --silent
-	yarn global add knex-migrator
-	NODE_ENV=production knex-migrator init
-	yarn global add grunt-cli ember-cli
-	NODE_ENV=production grunt symlink
-	NODE_ENV=production grunt init --force
+	ynh_exec_warn_less yarn install --non-interactive --silent
+	ynh_exec_warn_less yarn global add knex-migrator
+	ynh_exec_warn_less NODE_ENV=production knex-migrator init
+	ynh_exec_warn_less yarn global add grunt-cli ember-cli
+	ynh_exec_warn_less NODE_ENV=production grunt symlink
+	ynh_exec_warn_less NODE_ENV=production grunt init --force
 
 popd || ynh_die
 
diff --git a/scripts/upgrade b/scripts/upgrade
index cf364d6..a2af1bc 100644
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -156,12 +156,12 @@ then
 	ynh_script_progression --message="Building $app... (this will take some time and resources!)"
 
 	pushd "$final_path" || ynh_die
-		yarn install
-		yarn global add knex-migrator
-		NODE_ENV=production knex-migrator init
-		yarn global add grunt
-		NODE_ENV=production grunt symlink
-		NODE_ENV=production grunt init --force
+		ynh_exec_warn_less yarn install
+		ynh_exec_warn_less yarn global add knex-migrator
+		ynh_exec_warn_less NODE_ENV=production knex-migrator init
+		ynh_exec_warn_less yarn global add grunt
+		ynh_exec_warn_less NODE_ENV=production grunt symlink
+		ynh_exec_warn_less NODE_ENV=production grunt init --force
 
 	popd || ynh_die
 fi