diff --git a/rq/registry.py b/rq/registry.py
index c620eb9..beabbad 100644
--- a/rq/registry.py
+++ b/rq/registry.py
@@ -27,9 +27,9 @@ class BaseRegistry(object):
         self.cleanup()
         return self.connection.zcard(self.key)
 
-    def add(self, job, timeout, pipeline=None):
-        """Adds a job to a registry with expiry time of now + timeout."""
-        score = timeout if timeout < 0 else current_timestamp() + timeout
+    def add(self, job, ttl, pipeline=None):
+        """Adds a job to a registry with expiry time of now + ttl."""
+        score = ttl if ttl < 0 else current_timestamp() + ttl
         if pipeline is not None:
             return pipeline.zadd(self.key, score, job.id)