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-rw-r--r--libguile/weaks.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/libguile/weaks.h b/libguile/weaks.h
index e450ab0df..92a17c052 100644
--- a/libguile/weaks.h
+++ b/libguile/weaks.h
@@ -56,7 +56,7 @@
#define SCM_IS_WHVEC(X) (SCM_UNPACK (SCM_VELTS(X)[-1]) == 1)
#define SCM_IS_WHVEC_V(X) (SCM_UNPACK (SCM_VELTS(X)[-1]) == 2)
#define SCM_IS_WHVEC_B(X) (SCM_UNPACK (SCM_VELTS(X)[-1]) == 3)
-#define SCM_IS_WHVEC_ANY(X) (SCM_VELTS(X)[-1])
+#define SCM_IS_WHVEC_ANY(X) (SCM_UNPACK (SCM_VELTS(X)[-1]) != 0)
#define SCM_WVECT_GC_CHAIN(X) (SCM_VELTS(X)[-2])