1 files changed, 1 insertions, 1 deletions

diff --git a/drivers/xen/gntalloc.c b/drivers/xen/gntalloc.c
index 23c60cf4313e..e1c4c6e5b469 100644
--- a/drivers/xen/gntalloc.c
+++ b/drivers/xen/gntalloc.c
@@ -135,7 +135,7 @@ static int add_grefs(struct ioctl_gntalloc_alloc_gref *op,
                 /* Grant foreign access to the page. */
                 gref->gref_id = gnttab_grant_foreign_access(op->domid,
                         pfn_to_mfn(page_to_pfn(gref->page)), readonly);
-                if (gref->gref_id < 0) {
+                if ((int)gref->gref_id < 0) {
                         rc = gref->gref_id;
                         goto undo;
                 }