diff --git a/scripts/install b/scripts/install
index fadaac0..7947d6a 100644
--- a/scripts/install
+++ b/scripts/install
@@ -37,7 +37,7 @@ ynh_script_progression --message="Building app... (this will take some time and
 pushd "$install_dir/source"
     ynh_use_nodejs
     ynh_exec_warn_less ynh_exec_as "$app" "$ynh_node_load_PATH" "$ynh_npm" install
-    ynh_exec_warn_less "$ynh_node_load_PATH" "$ynh_npm" install gulp -g
+    ynh_exec_warn_less env "$ynh_node_load_PATH" "$ynh_npm" install gulp -g
     ynh_exec_warn_less ynh_exec_as "$app" "$ynh_node_load_PATH" "$ynh_npm" run build
 popd
 
diff --git a/scripts/upgrade b/scripts/upgrade
index e1dc7f2..a2c9626 100644
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -57,7 +57,7 @@ ynh_script_progression --message="Building app... (this will take some time and
 pushd "$install_dir/build"
     ynh_use_nodejs
     ynh_exec_warn_less ynh_exec_as "$app" "$ynh_node_load_PATH" "$ynh_npm" install
-    ynh_exec_warn_less "$ynh_node_load_PATH" "$ynh_npm" install gulp -g
+    ynh_exec_warn_less env "$ynh_node_load_PATH" "$ynh_npm" install gulp -g
     ynh_exec_warn_less ynh_exec_as "$app" "$ynh_node_load_PATH" "$ynh_npm" run build
 popd