diff --git a/src/afs/SOLARIS/osi_vnodeops.c b/src/afs/SOLARIS/osi_vnodeops.c
index 69dd98595a..f5e6ffd2b5 100644
--- a/src/afs/SOLARIS/osi_vnodeops.c
+++ b/src/afs/SOLARIS/osi_vnodeops.c
@@ -931,7 +931,7 @@ afs_nfsrdwr(struct vcache *avc, struct uio *auio, enum uio_rw arw,
 }
 
 int
-afs_map(struct vnode *vp, offset_t off, struct as *as, caddr_t *addr, u_int len, u_char prot, u_char maxprot, u_int flags, afs_ucred_t *cred)
+afs_map(struct vnode *vp, offset_t off, struct as *as, caddr_t *addr, size_t len, u_char prot, u_char maxprot, u_int flags, afs_ucred_t *cred)
 {
     struct segvn_crargs crargs;
     afs_int32 code;