diff --git a/tests/unit/test_builder.py b/tests/unit/test_builder.py
index 6c38ea60..355cbca7 100644
--- a/tests/unit/test_builder.py
+++ b/tests/unit/test_builder.py
@@ -167,11 +167,11 @@ class Consumer(builder.Consumer):
         request_method = request_definition_builder
 
     # Verify: Get request definition builder on access
-    assert Consumer.request_method is request_definition_builder
+    assert Consumer.request_method is request_definition_builder.copy()
 
     # Verify: Try again after resetting
     Consumer.request_method = request_definition_builder
-    assert Consumer.request_method is request_definition_builder
+    assert Consumer.request_method is request_definition_builder.copy()
 
     # Verify: We get callable on attribute access for an instance
     consumer = Consumer()
diff --git a/uplink/arguments.py b/uplink/arguments.py
index 1e7e7e79..979ec53d 100644
--- a/uplink/arguments.py
+++ b/uplink/arguments.py
@@ -120,6 +120,9 @@ def _process_annotation(self, name, annotation):
     def is_done(self):
         return self.remaining_args_count == 0
 
+    def copy(self):
+        return self
+
     @property
     def _types(self):
         types = self._annotations
diff --git a/uplink/builder.py b/uplink/builder.py
index 34b6fae6..79343197 100644
--- a/uplink/builder.py
+++ b/uplink/builder.py
@@ -181,7 +181,7 @@ def _build_definition(self):
 
     def __get__(self, instance, owner):
         if instance is None:
-            return self._request_definition_builder
+            return self._request_definition_builder.copy()
         else:
             return instance.session.create(instance, self._request_definition)
 
diff --git a/uplink/commands.py b/uplink/commands.py
index 61b58746..144bd2ad 100644
--- a/uplink/commands.py
+++ b/uplink/commands.py
@@ -155,6 +155,14 @@ def argument_handler_builder(self):
     def method_handler_builder(self):
         return self._method_handler_builder
 
+    def copy(self):
+        return RequestDefinitionBuilder(
+            self._method,
+            self._uri,
+            self._argument_handler_builder.copy(),
+            self._method_handler_builder.copy(),
+        )
+
     def _auto_fill_remaining_arguments(self):
         uri_vars = set(self.uri.remaining_variables)
         missing = list(self.argument_handler_builder.missing_arguments)
diff --git a/uplink/decorators.py b/uplink/decorators.py
index 62574d08..8db341e1 100644
--- a/uplink/decorators.py
+++ b/uplink/decorators.py
@@ -37,6 +37,12 @@ def add_annotation(self, annotation, *args_, **kwargs):
         super(MethodAnnotationHandlerBuilder, self).add_annotation(annotation)
         return annotation
 
+    def copy(self):
+        clone = MethodAnnotationHandlerBuilder()
+        clone._class_annotations = list(self._class_annotations)
+        clone._method_annotations = list(self._method_annotations)
+        return clone
+
     def build(self):
         return MethodAnnotationHandler(
             self._class_annotations + self._method_annotations
@@ -89,16 +95,18 @@ def _is_static_call(cls, *args_, **kwargs):
         else:
             return is_consumer_class and not (kwargs or args_[1:])
 
-    def __call__(self, class_or_builder):
+    def __call__(self, class_or_builder, **kwargs):
         if self._is_consumer_class(class_or_builder):
             builders = helpers.get_api_definitions(class_or_builder)
             builders = filter(self._is_relevant_for_builder, builders)
 
             for name, b in builders:
-                b.method_handler_builder.add_annotation(self, is_class=True)
+                self(b, is_class=True)
                 helpers.set_api_definition(class_or_builder, name, b)
         elif isinstance(class_or_builder, interfaces.RequestDefinitionBuilder):
-            class_or_builder.method_handler_builder.add_annotation(self)
+            class_or_builder.method_handler_builder.add_annotation(
+                self, **kwargs
+            )
         return class_or_builder
 
     def modify_request(self, request_builder):
diff --git a/uplink/interfaces.py b/uplink/interfaces.py
index b87057b2..b610aaf7 100644
--- a/uplink/interfaces.py
+++ b/uplink/interfaces.py
@@ -99,6 +99,9 @@ def method_handler_builder(self):
     def build(self):
         raise NotImplementedError
 
+    def copy(self):
+        raise NotImplementedError
+
 
 class RequestDefinition(object):
     def make_converter_registry(self, converters):