diff --git a/drivers/staging/ks7010/eap_packet.h b/drivers/staging/ks7010/eap_packet.h
index 3a5fade41cd934592b52b2d8519de9ac806843a3..d918742f023130a19de8eb909f093ca1f88cdc0c 100644
--- a/drivers/staging/ks7010/eap_packet.h
+++ b/drivers/staging/ks7010/eap_packet.h
@@ -6,8 +6,6 @@
 #include <linux/bitops.h>
 #include <uapi/linux/if_ether.h>
 
-#define ETHER_HDR_SIZE 20
-
 struct ether_hdr {
 	unsigned char h_dest[ETH_ALEN];	/* destination eth addr */
 	unsigned char h_source[ETH_ALEN];	/* source ether addr    */
@@ -19,6 +17,8 @@ struct ether_hdr {
 	/* followed by length octets of data */
 } __packed;
 
+#define ETHER_HDR_SIZE sizeof(struct ether_hdr)
+
 struct ieee802_1x_hdr {
 	unsigned char version;
 	unsigned char type;