diff --git a/src/common/wpa_common.h b/src/common/wpa_common.h
index 01efeea3a..404e571c0 100644
--- a/src/common/wpa_common.h
+++ b/src/common/wpa_common.h
@@ -17,6 +17,7 @@
 #define PMK_LEN_SUITE_B_192 48
 #define PMK_LEN_MAX 64
 #define WPA_REPLAY_COUNTER_LEN 8
+#define RSN_PN_LEN 6
 #define WPA_NONCE_LEN 32
 #define WPA_KEY_RSC_LEN 8
 #define WPA_GMK_LEN 32
@@ -343,47 +344,47 @@ struct rsn_error_kde {
 	be16 error_type;
 } STRUCT_PACKED;
 
-#define WPA_IGTK_KDE_PREFIX_LEN (2 + 6)
+#define WPA_IGTK_KDE_PREFIX_LEN (2 + RSN_PN_LEN)
 struct wpa_igtk_kde {
 	u8 keyid[2];
-	u8 pn[6];
+	u8 pn[RSN_PN_LEN];
 	u8 igtk[WPA_IGTK_MAX_LEN];
 } STRUCT_PACKED;
 
-#define WPA_BIGTK_KDE_PREFIX_LEN (2 + 6)
+#define WPA_BIGTK_KDE_PREFIX_LEN (2 + RSN_PN_LEN)
 struct wpa_bigtk_kde {
 	u8 keyid[2];
-	u8 pn[6];
+	u8 pn[RSN_PN_LEN];
 	u8 bigtk[WPA_BIGTK_MAX_LEN];
 } STRUCT_PACKED;
 
-#define RSN_MLO_GTK_KDE_PREFIX_LENGTH		(1 + 6)
+#define RSN_MLO_GTK_KDE_PREFIX_LENGTH		(1 + RSN_PN_LEN)
 #define RSN_MLO_GTK_KDE_PREFIX0_KEY_ID_MASK	0x03
 #define RSN_MLO_GTK_KDE_PREFIX0_TX		0x04
 #define RSN_MLO_GTK_KDE_PREFIX0_LINK_ID_SHIFT	4
 #define RSN_MLO_GTK_KDE_PREFIX0_LINK_ID_MASK	0xF0
 
-#define RSN_MLO_IGTK_KDE_PREFIX_LENGTH		(2 + 6 + 1)
+#define RSN_MLO_IGTK_KDE_PREFIX_LENGTH		(2 + RSN_PN_LEN + 1)
 #define RSN_MLO_IGTK_KDE_PREFIX8_LINK_ID_SHIFT	4
 #define RSN_MLO_IGTK_KDE_PREFIX8_LINK_ID_MASK	0xF0
 struct rsn_mlo_igtk_kde {
 	u8 keyid[2];
-	u8 pn[6];
+	u8 pn[RSN_PN_LEN];
 	u8 prefix8;
 	u8 igtk[WPA_IGTK_MAX_LEN];
 } STRUCT_PACKED;
 
-#define RSN_MLO_BIGTK_KDE_PREFIX_LENGTH		(2 + 6 + 1)
+#define RSN_MLO_BIGTK_KDE_PREFIX_LENGTH		(2 + RSN_PN_LEN + 1)
 #define RSN_MLO_BIGTK_KDE_PREFIX8_LINK_ID_SHIFT	4
 #define RSN_MLO_BIGTK_KDE_PREFIX8_LINK_ID_MASK	0xF0
 struct rsn_mlo_bigtk_kde {
 	u8 keyid[2];
-	u8 pn[6];
+	u8 pn[RSN_PN_LEN];
 	u8 prefix8;
 	u8 bigtk[WPA_BIGTK_MAX_LEN];
 } STRUCT_PACKED;
 
-#define RSN_MLO_LINK_KDE_FIXED_LENGTH		(1 + 6)
+#define RSN_MLO_LINK_KDE_FIXED_LENGTH		(1 + ETH_ALEN)
 #define RSN_MLO_LINK_KDE_LINK_INFO_INDEX	0
 #define RSN_MLO_LINK_KDE_LI_LINK_ID_SHIFT	0
 #define RSN_MLO_LINK_KDE_LI_LINK_ID_MASK	0x0F