diff --git a/drivers/net/wireless/ti/wl1251/acx.c b/drivers/net/wireless/ti/wl1251/acx.c
index ad87a1ac6462..db6430c1a084 100644
--- a/drivers/net/wireless/ti/wl1251/acx.c
+++ b/drivers/net/wireless/ti/wl1251/acx.c
@@ -869,7 +869,7 @@ int wl1251_acx_tsf_info(struct wl1251 *wl, u64 *mactime)
 	}
 
 	*mactime = tsf_info->current_tsf_lsb |
-		(tsf_info->current_tsf_msb << 31);
+		((u64)tsf_info->current_tsf_msb << 32);
 
 out:
 	kfree(tsf_info);