diff --git a/external/bsd/wpa/dist/src/drivers/driver_bsd.c b/external/bsd/wpa/dist/src/drivers/driver_bsd.c
index fdf91c51458d..2c9e449b9acb 100644
--- a/external/bsd/wpa/dist/src/drivers/driver_bsd.c
+++ b/external/bsd/wpa/dist/src/drivers/driver_bsd.c
@@ -626,6 +626,9 @@ bsd_get_seqnum(const char *ifname, void *priv, const u8 *addr, int idx,
 	}
 
 #ifdef WORDS_BIGENDIAN
+#ifndef WPA_KEY_RSC_LEN
+#define WPA_KEY_RSC_LEN 8
+#endif
 	{
 		/*
 		 * wk.ik_keytsc is in host byte order (big endian), need to