diff --git a/sys/sys/vnode.h b/sys/sys/vnode.h
index 0cd48ea4474..2cf62a51e10 100644
--- a/sys/sys/vnode.h
+++ b/sys/sys/vnode.h
@@ -134,7 +134,7 @@ struct vnode {
 	seqc_t	v_seqc;				/* i modification count */
 	uint32_t v_nchash;			/* u namecache hash */
 	u_int	v_hash;
-	struct	vop_vector *v_op;		/* u vnode operations vector */
+	const struct vop_vector *v_op;		/* u vnode operations vector */
 	void	*v_data;			/* u private data for fs */
 
 	/*
diff --git a/sys/tools/vnode_if.awk b/sys/tools/vnode_if.awk
index 0fff9a83175..b477bbc91c4 100644
--- a/sys/tools/vnode_if.awk
+++ b/sys/tools/vnode_if.awk
@@ -328,7 +328,7 @@ while ((getline < srcfile) > 0) {
 
 		# Print out function prototypes.
 		printh("int " uname "_AP(struct " name "_args *);");
-		printh("int " uname "_APV(struct vop_vector *vop, struct " name "_args *);");
+		printh("int " uname "_APV(const struct vop_vector *vop, struct " name "_args *);");
 		printh("");
 		printh("static __inline int " uname "(");
 		for (i = 0; i < numargs; ++i) {
@@ -392,7 +392,7 @@ while ((getline < srcfile) > 0) {
 		printc("");
 		printc("\treturn(" uname "_APV(a->a_" args[0] "->v_op, a));");
 		printc("}");
-		printc("\nint\n" uname "_APV(struct vop_vector *vop, struct " name "_args *a)");
+		printc("\nint\n" uname "_APV(const struct vop_vector *vop, struct " name "_args *a)");
 		printc("{");
 		printc("\tint rc;");
 		printc("");