diff --git a/internal/resolver/errors.go b/internal/resolver/errors.go
index 94bc313..3f203d4 100644
--- a/internal/resolver/errors.go
+++ b/internal/resolver/errors.go
@@ -4,11 +4,6 @@ import "errors"
 
 // Sentinel errors returned by the resolver.
 var (
-	// ErrNotImplemented indicates a method is stubbed out.
-	ErrNotImplemented = errors.New(
-		"resolver not yet implemented",
-	)
-
 	// ErrNoNameservers is returned when no authoritative NS
 	// could be discovered for a domain.
 	ErrNoNameservers = errors.New(