diff --git a/sys/cddl/contrib/opensolaris/uts/common/sys/sysmacros.h b/sys/cddl/contrib/opensolaris/uts/common/sys/sysmacros.h
--- a/sys/cddl/contrib/opensolaris/uts/common/sys/sysmacros.h
+++ b/sys/cddl/contrib/opensolaris/uts/common/sys/sysmacros.h
@@ -392,7 +392,7 @@
 static __inline int
 highbit(unsigned long i)
 {
-#if defined(__FreeBSD__) && defined(_KERNEL) && defined(HAVE_INLINE_FLSL)
+#if defined(__FreeBSD__) && defined(_KERNEL)
 	return (flsl(i));
 #else
 	int h = 1;
@@ -430,7 +430,7 @@
 static __inline int
 highbit64(uint64_t i)
 {
-#if defined(__FreeBSD__) && defined(_KERNEL) && defined(HAVE_INLINE_FLSLL)
+#if defined(__FreeBSD__) && defined(_KERNEL)
 	return (flsll(i));
 #else
 	int h = 1;