diff --git a/fixtures/genericparam/genericparam.go b/fixtures/genericparam/genericparam.go
index c75c413..7a96f87 100644
--- a/fixtures/genericparam/genericparam.go
+++ b/fixtures/genericparam/genericparam.go
@@ -5,6 +5,8 @@ import (
 	"github.com/maxbrunsfeld/counterfeiter/v6/fixtures/genericparam/genericreturntype"
 )
 
+//go:generate go run github.com/maxbrunsfeld/counterfeiter/v6 -generate
+
 //counterfeiter:generate . GenericParamFunc
 type GenericParamFunc func(Generic[genericparamtype.T]) Generic[genericreturntype.R]