diff --git a/lib/cartodb/controllers/layergroup/tile.js b/lib/cartodb/controllers/layergroup/tile.js
index 17c35377..4008afa4 100644
--- a/lib/cartodb/controllers/layergroup/tile.js
+++ b/lib/cartodb/controllers/layergroup/tile.js
@@ -41,10 +41,11 @@ module.exports = class TileLayergroupController {
     }
 
     register (mapRouter) {
-        const number = (param) => `${param}(-?\\d+)`;
+        const number = () => `(-?\\d+)`;
+        const not = (val) => `(?!${val})([^\/]+?)`;
 
         mapRouter.get(
-            `/:token/:${number('z')}/:${number('x')}/:${number('y')}@:${number('scale_factor')}?x.:format`,
+            `/:token/:z${number()}/:x${number()}/:y${number()}@:scale_factor${number()}?x.:format`,
             layergroupToken(),
             credentials(),
             authorize(this.authApi),
@@ -69,7 +70,7 @@ module.exports = class TileLayergroupController {
         );
 
         mapRouter.get(
-            `/:token/:${number('z')}/:${number('x')}/:${number('y')}.:format`,
+            `/:token/:z${number()}/:x${number()}/:y${number()}.:format`,
             layergroupToken(),
             credentials(),
             authorize(this.authApi),
@@ -94,8 +95,7 @@ module.exports = class TileLayergroupController {
         );
 
         mapRouter.get(
-            `/:token/:layer/:${number('z')}/:${number('x')}/:${number('y')}.(:format)`,
-            distinguishLayergroupFromStaticRoute(),
+            `/:token${not('static')}/:layer/:z${number()}/:x${number()}/:y${number()}.(:format)`,
             layergroupToken(),
             credentials(),
             authorize(this.authApi),
@@ -121,16 +121,6 @@ module.exports = class TileLayergroupController {
     }
 };
 
-function distinguishLayergroupFromStaticRoute () {
-    return function distinguishLayergroupFromStaticRouteMiddleware(req, res, next) {
-        if (req.params.token === 'static') {
-            return next('route');
-        }
-
-        next();
-    };
-}
-
 function parseFormat (format = '') {
     const prettyFormat = format.replace('.', '_');
     return SUPPORTED_FORMATS[prettyFormat] ? prettyFormat : 'invalid';