diff --git a/lib/cartodb/cache/backend/varnish_http.js b/lib/cartodb/cache/backend/varnish_http.js
index 25ff2745..f9af6f6a 100644
--- a/lib/cartodb/cache/backend/varnish_http.js
+++ b/lib/cartodb/cache/backend/varnish_http.js
@@ -17,7 +17,7 @@ VarnishHttpCacheBackend.prototype.invalidate = function(cacheObject, callback) {
             method: 'PURGE',
             url: 'http://' + this.host + ':' + this.port + '/key',
             headers: {
-                'Invalidation-Match': '\b' + cacheObject.key() + '\b'
+                'Invalidation-Match': '\\b' + cacheObject.key() + '\\b'
             }
         },
         function(err, response) {