diff --git a/prototype.go b/prototype.go
index 90e9aa3..4bf7132 100644
--- a/prototype.go
+++ b/prototype.go
@@ -30,12 +30,7 @@ type ErrorResponse interface {
 	Error() (out string)
 }
 
-type PrototypeErrorResponse interface {
-	ErrorResponse() (errRes ErrorResponse)
-}
-
 type Prototype struct {
 	PrototypeRequestBuilder
 	PrototypeResponse
-	PrototypeErrorResponse
 }