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-rw-r--r--module/oop/goops.scm6
1 files changed, 4 insertions, 2 deletions
diff --git a/module/oop/goops.scm b/module/oop/goops.scm
index 4bde684e7..df6df4f7b 100644
--- a/module/oop/goops.scm
+++ b/module/oop/goops.scm
@@ -1,6 +1,7 @@
;;;; goops.scm -- The Guile Object-Oriented Programming System
;;;;
-;;;; Copyright (C) 1998-2003,2006,2009-2011,2013-2015,2017 Free Software Foundation, Inc.
+;;;; Copyright (C) 1998-2003,2006,2009-2011,2013-2015,2017-2018
+;;;; Free Software Foundation, Inc.
;;;; Copyright (C) 1993-1998 Erick Gallesio - I3S-CNRS/ESSI <eg@unice.fr>
;;;;
;;;; This library is free software; you can redistribute it and/or
@@ -285,7 +286,8 @@
(class-has-flags? (struct-vtable obj) vtable-flag-goops-slot)))
(define-inlinable (instance? obj)
- (class-has-flags? (struct-vtable obj) vtable-flag-goops-class))
+ (and (struct? obj)
+ (class-has-flags? (struct-vtable obj) vtable-flag-goops-class)))
(define (class-has-statically-allocated-slots? class)
(class-has-flags? class vtable-flag-goops-static-slot-allocation))