diff --git a/modules/invoiceOut/back/methods/invoiceOut/book.js b/modules/invoiceOut/back/methods/invoiceOut/book.js
index eeddcd7f5..745e8e3c5 100644
--- a/modules/invoiceOut/back/methods/invoiceOut/book.js
+++ b/modules/invoiceOut/back/methods/invoiceOut/book.js
@@ -15,7 +15,7 @@ module.exports = Self => {
             root: true
         },
         http: {
-            path: `/:ref/book`,
+            path: '/:ref/book',
             verb: 'POST'
         }
     });
diff --git a/modules/invoiceOut/back/methods/invoiceOut/delete.js b/modules/invoiceOut/back/methods/invoiceOut/delete.js
index 0883952e8..afbd226a8 100644
--- a/modules/invoiceOut/back/methods/invoiceOut/delete.js
+++ b/modules/invoiceOut/back/methods/invoiceOut/delete.js
@@ -15,7 +15,7 @@ module.exports = Self => {
             root: true
         },
         http: {
-            path: `/:id/delete`,
+            path: '/:id/delete',
             verb: 'POST'
         }
     });
diff --git a/modules/invoiceOut/back/methods/invoiceOut/regenerate.js b/modules/invoiceOut/back/methods/invoiceOut/regenerate.js
index 762acfffc..77123318a 100644
--- a/modules/invoiceOut/back/methods/invoiceOut/regenerate.js
+++ b/modules/invoiceOut/back/methods/invoiceOut/regenerate.js
@@ -14,7 +14,7 @@ module.exports = Self => {
             root: true
         },
         http: {
-            path: `/:id/regenerate`,
+            path: '/:id/regenerate',
             verb: 'POST'
         }
     });