diff --git a/aiocache/decorators.py b/aiocache/decorators.py
index 114b22c2..d171bb3b 100644
--- a/aiocache/decorators.py
+++ b/aiocache/decorators.py
@@ -106,7 +106,7 @@ def get_cache_key(self, f, args, kwargs):
         if self.key:
             return self.key
         if self.key_builder:
-            return self.key_builder(*args, **kwargs)
+            return self.key_builder(f, *args, **kwargs)
 
         return self._key_from_args(f, args, kwargs)
 
diff --git a/tests/acceptance/test_decorators.py b/tests/acceptance/test_decorators.py
index 23921655..1b41bbda 100644
--- a/tests/acceptance/test_decorators.py
+++ b/tests/acceptance/test_decorators.py
@@ -41,15 +41,15 @@ async def fn():
 
     @pytest.mark.asyncio
     async def test_cached_key_builder(self, cache):
-        def build_key(self, a, b):
-            return "{}_{}_{}".format(self, a, b)
+        def build_key(f, self, a, b):
+            return "{}_{}_{}_{}".format(self, f.__name__, a, b)
 
         @cached(key_builder=build_key)
         async def fn(self, a, b=2):
             return "1"
 
         await fn("self", 1, 3)
-        assert await cache.exists(build_key("self", 1, 3)) is True
+        assert await cache.exists(build_key(fn, "self", 1, 3)) is True
 
 
 class TestCachedStampede: