diff --git a/drivers/net/wireless/hostap/hostap_common.h b/drivers/net/wireless/hostap/hostap_common.h
index 01624005d808f541ae30f762ab5e4dad1785ff8e..b31e6a05f23cc5a97a5b35fa448a12896eed1ed9 100644
--- a/drivers/net/wireless/hostap/hostap_common.h
+++ b/drivers/net/wireless/hostap/hostap_common.h
@@ -368,9 +368,9 @@ enum {
 
 #define PRISM2_HOSTAPD_MAX_BUF_SIZE 1024
 #define PRISM2_HOSTAPD_RID_HDR_LEN \
-((int) (&((struct prism2_hostapd_param *) 0)->u.rid.data))
+offsetof(struct prism2_hostapd_param, u.rid.data)
 #define PRISM2_HOSTAPD_GENERIC_ELEMENT_HDR_LEN \
-((int) (&((struct prism2_hostapd_param *) 0)->u.generic_elem.data))
+offsetof(struct prism2_hostapd_param, u.generic_elem.data)
 
 /* Maximum length for algorithm names (-1 for nul termination) used in ioctl()
  */