diff --git a/redis_cache/__init__.py b/redis_cache/__init__.py
index 08c0585..959e207 100644
--- a/redis_cache/__init__.py
+++ b/redis_cache/__init__.py
@@ -4,7 +4,7 @@
 from inspect import signature
 
 def compact_dump(value):
-    return dumps(value, separators=(',', ':'))
+    return dumps(value, separators=(',', ':'), sort_keys=True)
 
 def get_args(fn, args, kwargs):
     """
@@ -168,7 +168,7 @@ def __init__(self, redis_client, prefix="rc", serializer=compact_dump, deseriali
 
 
     def get_full_prefix(self):
-        return f'{{{self.prefix}:{self.namespace}}}'
+        return f'{self.prefix}:{self.namespace}'
 
     def get_key(self, args, kwargs):
         normalized_args = get_args(self.original_fn, args, kwargs)
diff --git a/tests/test_redis_cache.py b/tests/test_redis_cache.py
index 7f1a15b..305ebd9 100644
--- a/tests/test_redis_cache.py
+++ b/tests/test_redis_cache.py
@@ -233,7 +233,7 @@ def add_custom_key_serializer(arg1, arg2):
     encoded_args = b64encode("{'arg1': 2, 'arg2': 3}".encode('utf-8')).decode('utf-8')
 
     assert r1 == r2
-    assert client.exists(f'{{rc:test_redis_cache.test_custom_key_serializer.<locals>.add_custom_key_serializer}}:{encoded_args}')
+    assert client.exists(f'rc:test_redis_cache.test_custom_key_serializer.<locals>.add_custom_key_serializer:{encoded_args}')
 
 
 def test_basic_mget(cache):