diff --git a/share/man/man9/osd.9 b/share/man/man9/osd.9
--- a/share/man/man9/osd.9
+++ b/share/man/man9/osd.9
@@ -23,7 +23,7 @@
 .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 .\" SUCH DAMAGE.
 .\"
-.Dd April 26, 2016
+.Dd July 01, 2024
 .Dt OSD 9
 .Os
 .Sh NAME
@@ -49,7 +49,7 @@
 .Fo osd_register
 .Fa "u_int type"
 .Fa "osd_destructor_t destructor"
-.Fa "osd_method_t *methods"
+.Fa "const osd_method_t *methods"
 .Fc
 .Ft void
 .Fo osd_deregister
diff --git a/sys/kern/kern_osd.c b/sys/kern/kern_osd.c
--- a/sys/kern/kern_osd.c
+++ b/sys/kern/kern_osd.c
@@ -90,7 +90,7 @@
 }
 
 int
-osd_register(u_int type, osd_destructor_t destructor, osd_method_t *methods)
+osd_register(u_int type, osd_destructor_t destructor, const osd_method_t *methods)
 {
 	void *newptr;
 	u_int i, m;
diff --git a/sys/sys/osd.h b/sys/sys/osd.h
--- a/sys/sys/osd.h
+++ b/sys/sys/osd.h
@@ -55,7 +55,7 @@
 typedef int (*osd_method_t)(void *obj, void *data);
 
 int osd_register(u_int type, osd_destructor_t destructor,
-    osd_method_t *methods);
+    const osd_method_t *methods);
 void osd_deregister(u_int type, u_int slot);
 
 int osd_set(u_int type, struct osd *osd, u_int slot, void *value);