diff --git a/jedi/evaluate/context/function.py b/jedi/evaluate/context/function.py
index 12df343b..203dcf0d 100644
--- a/jedi/evaluate/context/function.py
+++ b/jedi/evaluate/context/function.py
@@ -101,7 +101,7 @@ class FunctionMixin(object):
         return FunctionExecutionContext(self.evaluator, self.parent_context, self, arguments)
 
     def get_signatures(self):
-        return [TreeSignature(self)]
+        return [TreeSignature(f) for f in self.get_signature_functions()]
 
 
 class FunctionContext(use_metaclass(CachedMetaClass, FunctionMixin, FunctionAndClassBase)):
@@ -150,6 +150,9 @@ class FunctionContext(use_metaclass(CachedMetaClass, FunctionMixin, FunctionAndC
     def get_default_param_context(self):
         return self.parent_context
 
+    def get_signature_functions(self):
+        return [self]
+
 
 class MethodContext(FunctionContext):
     def __init__(self, evaluator, class_context, *args, **kwargs):
@@ -393,8 +396,8 @@ class OverloadedFunctionContext(FunctionMixin, ContextWrapper):
             return NO_CONTEXTS
         return ContextSet.from_sets(fe.infer() for fe in function_executions)
 
-    def get_signatures(self):
-        return [s for f in self._overloaded_functions for s in f.get_signatures()]
+    def get_signature_functions(self):
+        return self._overloaded_functions
 
 
 def _find_overload_functions(context, tree_node):
diff --git a/jedi/evaluate/context/instance.py b/jedi/evaluate/context/instance.py
index 91bc3184..e00ff031 100644
--- a/jedi/evaluate/context/instance.py
+++ b/jedi/evaluate/context/instance.py
@@ -399,8 +399,14 @@ class BoundMethod(FunctionMixin, ContextWrapper):
         function_execution = self.get_function_execution(arguments)
         return function_execution.infer()
 
+    def get_signature_functions(self):
+        return [
+            BoundMethod(self.instance, f)
+            for f in self._wrapped_context.get_signature_functions()
+        ]
+
     def get_signatures(self):
-        return [sig.bind(self, self) for sig in self._wrapped_context.get_signatures()]
+        return [sig.bind(self) for sig in super(BoundMethod, self).get_signatures()]
 
     def __repr__(self):
         return '<%s: %s>' % (self.__class__.__name__, self._wrapped_context)
diff --git a/jedi/evaluate/signature.py b/jedi/evaluate/signature.py
index d225ae13..ee832dcc 100644
--- a/jedi/evaluate/signature.py
+++ b/jedi/evaluate/signature.py
@@ -50,7 +50,7 @@ class AbstractSignature(_SignatureMixin):
             return param_names[1:]
         return param_names
 
-    def bind(self, context, function_context=None):
+    def bind(self, context):
         raise NotImplementedError
 
     def __repr__(self):
@@ -62,8 +62,8 @@ class TreeSignature(AbstractSignature):
         super(TreeSignature, self).__init__(context, is_bound)
         self._function_context = function_context or context
 
-    def bind(self, context, function_context=None):
-        return TreeSignature(context, function_context or self._function_context, is_bound=True)
+    def bind(self, context):
+        return TreeSignature(context, self._function_context, is_bound=True)
 
     @property
     def _annotation(self):
@@ -101,7 +101,7 @@ class BuiltinSignature(AbstractSignature):
     def _function_context(self):
         return self.context
 
-    def bind(self, context, function_context=None):
+    def bind(self, context):
         assert not self.is_bound
         return BuiltinSignature(context, self._return_string, is_bound=True)
 
diff --git a/jedi/plugins/stdlib.py b/jedi/plugins/stdlib.py
index 9019d83d..4c3d9ccb 100644
--- a/jedi/plugins/stdlib.py
+++ b/jedi/plugins/stdlib.py
@@ -666,6 +666,9 @@ class Wrapped(ContextWrapper, FunctionMixin):
     def name(self):
         return self._original_function.name
 
+    def get_signature_functions(self):
+        return [self]
+
 
 class ReplacedNameSignature(SignatureWrapper):
     def __init__(self, signature, name):