diff --git a/sys/compat/freebsd32/freebsd32.h b/sys/compat/freebsd32/freebsd32.h
index 7324f9adf70..7d21a5be557 100644
--- a/sys/compat/freebsd32/freebsd32.h
+++ b/sys/compat/freebsd32/freebsd32.h
@@ -70,7 +70,7 @@ struct itimerspec32 {
 
 struct bintime32 {
 	time32_t sec;
-	uint32_t frac[2];
+	freebsd32_uint64_t frac;
 };
 
 struct ffclock_estimate32 {
diff --git a/sys/sys/abi_compat.h b/sys/sys/abi_compat.h
index 0a711019143..bd99a21d8e2 100644
--- a/sys/sys/abi_compat.h
+++ b/sys/sys/abi_compat.h
@@ -77,7 +77,7 @@
 
 #define	BT_CP(src, dst, fld) do {				\
 	CP((src).fld, (dst).fld, sec);				\
-	*(uint64_t *)&(dst).fld.frac[0] = (src).fld.frac;	\
+	FU64_CP((src).fld, (dst).fld, frac);			\
 } while (0)
 
 #endif /* !_COMPAT_H_ */