diff --git a/rest_framework/routers.py b/rest_framework/routers.py
index fa5d16922..3011026fa 100644
--- a/rest_framework/routers.py
+++ b/rest_framework/routers.py
@@ -231,7 +231,7 @@ class SimpleRouter(BaseRouter):
         """
         bound_methods = {}
         for method, action in method_map.items():
-            if hasattr(viewset, action):
+            if getattr(viewset, action, None) is not None:
                 bound_methods[method] = action
         return bound_methods