diff --git a/lib/libzfs/libzfs_dataset.c b/lib/libzfs/libzfs_dataset.c
index 27268adbaf..1df6994208 100644
--- a/lib/libzfs/libzfs_dataset.c
+++ b/lib/libzfs/libzfs_dataset.c
@@ -2228,7 +2228,8 @@ zfs_prop_get_userquota(zfs_handle_t *zhp, const char *propname,
 		return (err);
 
 	if (literal) {
-		(void) snprintf(propbuf, proplen, "%llu", propvalue);
+		(void) snprintf(propbuf, proplen, "%llu",
+			       (u_longlong_t)propvalue);
 	} else if (propvalue == 0 &&
 	    (type == ZFS_PROP_USERQUOTA || type == ZFS_PROP_GROUPQUOTA)) {
 		(void) strlcpy(propbuf, "none", proplen);