diff --git a/src/spectator/mocks/expect_any_instance.cr b/src/spectator/mocks/expect_any_instance.cr
index c51c0e8..9d9769e 100644
--- a/src/spectator/mocks/expect_any_instance.cr
+++ b/src/spectator/mocks/expect_any_instance.cr
@@ -7,7 +7,7 @@ module Spectator::Mocks
 
     def to(stub : MethodStub) : Nil
       actual = TestValue.new(T)
-      Harness.current.mocks.expect(T, stub.name)
+      Harness.current.mocks.expect(T, stub)
       value = TestValue.new(stub.name, stub.to_s)
       matcher = Matchers::ReceiveTypeMatcher.new(value, stub.arguments?)
       partial = Expectations::ExpectationPartial.new(actual, @source)