diff --git a/frontend/http/bencode/encoder.go b/frontend/http/bencode/encoder.go
index 41093ae..9038e99 100644
--- a/frontend/http/bencode/encoder.go
+++ b/frontend/http/bencode/encoder.go
@@ -90,7 +90,7 @@ func marshal(w io.Writer, data interface{}) (err error) {
 		err = marshalList(w, v)
 
 	default:
-		return fmt.Errorf("attempted to marshal unsupported type:\n%t", v)
+		return fmt.Errorf("attempted to marshal unsupported type:\n%T", v)
 	}
 
 	return err