diff --git a/sys/kern/kern_conf.c b/sys/kern/kern_conf.c
index db9a485ee5bf..d0c988b26054 100644
--- a/sys/kern/kern_conf.c
+++ b/sys/kern/kern_conf.c
@@ -426,7 +426,7 @@ devtoname(dev_t dev)
 }
 
 int
-dev_stdclone(char *name, char **namep, char *stem, int *unit)
+dev_stdclone(char *name, char **namep, const char *stem, int *unit)
 {
 	int u, i;
 
diff --git a/sys/sys/conf.h b/sys/sys/conf.h
index 130f5cb155c3..f4e3dded4f19 100644
--- a/sys/sys/conf.h
+++ b/sys/sys/conf.h
@@ -353,7 +353,7 @@ extern int devfs_present;
 
 typedef void (*dev_clone_fn) __P((void *arg, char *name, int namelen, dev_t *result));
 
-int dev_stdclone __P((char *name, char **namep, char *stem, int *unit));
+int dev_stdclone __P((char *name, char **namep, const char *stem, int *unit));
 EVENTHANDLER_DECLARE(dev_clone, dev_clone_fn);
 #endif /* _KERNEL */
 
diff --git a/sys/sys/linedisc.h b/sys/sys/linedisc.h
index 130f5cb155c3..f4e3dded4f19 100644
--- a/sys/sys/linedisc.h
+++ b/sys/sys/linedisc.h
@@ -353,7 +353,7 @@ extern int devfs_present;
 
 typedef void (*dev_clone_fn) __P((void *arg, char *name, int namelen, dev_t *result));
 
-int dev_stdclone __P((char *name, char **namep, char *stem, int *unit));
+int dev_stdclone __P((char *name, char **namep, const char *stem, int *unit));
 EVENTHANDLER_DECLARE(dev_clone, dev_clone_fn);
 #endif /* _KERNEL */