diff --git a/scsh/bsd/sigset.h b/scsh/bsd/sigset.h
index f30fa8c..3c62453 100644
--- a/scsh/bsd/sigset.h
+++ b/scsh/bsd/sigset.h
@@ -1,10 +1,19 @@
 /* Convert between a lo24/hi integer-pair bitset and a sigset_t value.
 ** These macros are OS-dependent, and must be defined per-OS.
 */
+#include <sys/param.h>
+#if defined __FreeBSD_version && __FreeBSD_version > 400000
+#define make_sigset(maskp, hi, lo)(*maskp.__bits[0] = ((hi)<<24)|(lo))
 
+/* Not a procedure: */
+#define split_sigset(mask, hip, lop) \
+	((*(hip)=(mask.__bits[0]>>24)&0xff), \
+	 (*(lop)=(mask.__bits[0]&0xffffff)))
+#else
 #define make_sigset(maskp, hi, lo) (*maskp=((hi)<<24)|(lo))
 
 /* Not a procedure: */
 #define split_sigset(mask, hip, lop) \
 	((*(hip)=(mask>>24)&0xff), \
 	 (*(lop)=(mask&0xffffff)))
+#endif