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-rw-r--r--libguile/goops.h3
1 files changed, 1 insertions, 2 deletions
diff --git a/libguile/goops.h b/libguile/goops.h
index 599d6944f..710abb941 100644
--- a/libguile/goops.h
+++ b/libguile/goops.h
@@ -99,8 +99,7 @@ typedef struct scm_t_method {
#define SCM_CLASS_OF(x) SCM_STRUCT_VTABLE (x)
#define SCM_ACCESSORS_OF(x) (SCM_PACK (SCM_STRUCT_VTABLE_DATA (x)[scm_si_getters_n_setters]))
#define SCM_NUMBER_OF_SLOTS(x) \
- (SCM_UNPACK (SCM_STRUCT_DATA (x)[scm_struct_i_n_words]) \
- - scm_struct_n_extra_words)
+ ((SCM_STRUCT_DATA (x)[scm_struct_i_n_words]) - scm_struct_n_extra_words)
#define SCM_CLASSP(x) \
(SCM_STRUCTP (x) && SCM_STRUCT_VTABLE_FLAGS (x) & SCM_CLASSF_METACLASS)