diff --git a/fs/cifs/cifssmb.c b/fs/cifs/cifssmb.c
index 005fb31..79a01d3 100644
--- a/fs/cifs/cifssmb.c
+++ b/fs/cifs/cifssmb.c
@@ -477,7 +477,7 @@
 			server->capabilities = CAP_MPX_MODE;
 		}
 		tmp = (__s16)le16_to_cpu(rsp->ServerTimeZone);
-		if (tmp == 0xffff) {
+		if (tmp == -1) {
 			/* OS/2 often does not set timezone therefore
 			 * we must use server time to calc time zone.
 			 * Could deviate slightly from the right zone.