diff --git a/sys/kern/subr_uio.c b/sys/kern/subr_uio.c
index 6e81328e505c..d49e3c3a2631 100644
--- a/sys/kern/subr_uio.c
+++ b/sys/kern/subr_uio.c
@@ -437,7 +437,7 @@ copyinstrfrom(const void * __restrict src, void * __restrict dst, size_t len,
 }
 
 int
-copyiniov(struct iovec *iovp, u_int iovcnt, struct iovec **iov, int error)
+copyiniov(const struct iovec *iovp, u_int iovcnt, struct iovec **iov, int error)
 {
 	u_int iovlen;
 
@@ -455,7 +455,7 @@ copyiniov(struct iovec *iovp, u_int iovcnt, struct iovec **iov, int error)
 }
 
 int
-copyinuio(struct iovec *iovp, u_int iovcnt, struct uio **uiop)
+copyinuio(const struct iovec *iovp, u_int iovcnt, struct uio **uiop)
 {
 	struct iovec *iov;
 	struct uio *uio;
diff --git a/sys/sys/uio.h b/sys/sys/uio.h
index 5df279b265db..f3cc20f84e46 100644
--- a/sys/sys/uio.h
+++ b/sys/sys/uio.h
@@ -89,11 +89,11 @@ struct vm_page;
 struct uio *cloneuio(struct uio *uiop);
 int	copyinfrom(const void * __restrict src, void * __restrict dst,
 	    size_t len, int seg);
-int	copyiniov(struct iovec *iovp, u_int iovcnt, struct iovec **iov,
+int	copyiniov(const struct iovec *iovp, u_int iovcnt, struct iovec **iov,
 	    int error);
 int	copyinstrfrom(const void * __restrict src, void * __restrict dst,
 	    size_t len, size_t * __restrict copied, int seg);
-int	copyinuio(struct iovec *iovp, u_int iovcnt, struct uio **uiop);
+int	copyinuio(const struct iovec *iovp, u_int iovcnt, struct uio **uiop);
 int	copyout_map(struct thread *td, vm_offset_t *addr, size_t sz);
 int	copyout_unmap(struct thread *td, vm_offset_t addr, size_t sz);
 int	uiomove(void *cp, int n, struct uio *uio);