diff --git a/hostapd/hostap_common.h b/hostapd/hostap_common.h
index 1e38df38f..5a57dca46 100644
--- a/hostapd/hostap_common.h
+++ b/hostapd/hostap_common.h
@@ -147,9 +147,9 @@ enum {
 
 #define PRISM2_HOSTAPD_MAX_BUF_SIZE 1024
 #define PRISM2_HOSTAPD_RID_HDR_LEN \
-((int) (&((struct prism2_hostapd_param *) 0)->u.rid.data))
+((size_t) (&((struct prism2_hostapd_param *) 0)->u.rid.data))
 #define PRISM2_HOSTAPD_GENERIC_ELEMENT_HDR_LEN \
-((int) (&((struct prism2_hostapd_param *) 0)->u.generic_elem.data))
+((size_t) (&((struct prism2_hostapd_param *) 0)->u.generic_elem.data))
 
 /* Maximum length for algorithm names (-1 for nul termination) used in ioctl()
  */
diff --git a/src/drivers/driver_hostap.h b/src/drivers/driver_hostap.h
index a83322f7e..a2508ed92 100644
--- a/src/drivers/driver_hostap.h
+++ b/src/drivers/driver_hostap.h
@@ -84,9 +84,9 @@ enum {
 
 #define PRISM2_HOSTAPD_MAX_BUF_SIZE 1024
 #define PRISM2_HOSTAPD_RID_HDR_LEN \
-((int) (&((struct prism2_hostapd_param *) 0)->u.rid.data))
+((size_t) (&((struct prism2_hostapd_param *) 0)->u.rid.data))
 #define PRISM2_HOSTAPD_GENERIC_ELEMENT_HDR_LEN \
-((int) (&((struct prism2_hostapd_param *) 0)->u.generic_elem.data))
+((size_t) (&((struct prism2_hostapd_param *) 0)->u.generic_elem.data))
 
 /* Maximum length for algorithm names (-1 for nul termination) used in ioctl()
  */