diff --git a/sw/airborne/modules/datalink/gec/gec.h b/sw/airborne/modules/datalink/gec/gec.h
index 1a94cf08eb..1aaa386f17 100644
--- a/sw/airborne/modules/datalink/gec/gec.h
+++ b/sw/airborne/modules/datalink/gec/gec.h
@@ -62,34 +62,6 @@
 // basepoint value for the scalar curve multiplication
 #define PPRZ_CURVE_BASEPOINT 9
 
-#if PPRZLINK_DEFAULT_VER == 2
-// minimal size of the encrypted message
-#define PPRZ_MSG_ID 3
-// index of the message ID for plaintext messages
-#define PPRZ_PLAINTEXT_MSG_ID_IDX 4
-// 4 bytes of MSG info (source_ID, dest_ID, class_byte, msg_ID) + 1 GEC byte
-#define PPRZ_PLAINTEXT_MSG_MIN_LEN 5
-// 20 bytes crypto overhead + 4 bytes MSG info + 1 GEC byte
-#define PPRZ_ENCRYPTED_MSG_MIN_LEN 25
-// length of the authenticated data (SOURCE ID, DEST ID)
-#define PPRZ_AUTH_LEN 2
-// index of the beginning of the ciphertext
-#define PPRZ_CIPH_IDX 7
-#else // PPRZLINK_DEFAULT_VER = 1
-// minimal size of the encrypted message
-#define PPRZ_MSG_ID 1
-// index of the message ID for plaintext messages
-#define PPRZ_PLAINTEXT_MSG_ID_IDX 2
-// 2 bytes of MSG info (source_ID, msg_ID) + 1 GEC byte
-#define PPRZ_PLAINTEXT_MSG_MIN_LEN 3
-// 20 bytes crypto overhead + 2 bytes MSG info + 1 GEC byte
-#define PPRZ_ENCRYPTED_MSG_MIN_LEN 23
-// length of the authenticated data (SOURCE ID)
-#define PPRZ_AUTH_LEN 1
-// index of the beginning of the ciphertext
-#define PPRZ_CIPH_IDX 6
-#endif
-
 typedef unsigned char ed25519_signature[64];
 
 struct gec_privkey {
diff --git a/sw/airborne/modules/datalink/gec_dl.c b/sw/airborne/modules/datalink/gec_dl.c
index 03036a74b8..b73bc52991 100644
--- a/sw/airborne/modules/datalink/gec_dl.c
+++ b/sw/airborne/modules/datalink/gec_dl.c
@@ -29,6 +29,36 @@
 #include "pprzlink/messages.h"
 #include <string.h> // for memset()
 
+#if PPRZLINK_DEFAULT_VER == 2
+// minimal size of the encrypted message
+#define PPRZ_MSG_ID 3
+// index of the message ID for plaintext messages
+#define PPRZ_PLAINTEXT_MSG_ID_IDX 4
+// 4 bytes of MSG info (source_ID, dest_ID, class_byte, msg_ID) + 1 GEC byte
+#define PPRZ_PLAINTEXT_MSG_MIN_LEN 5
+// 20 bytes crypto overhead + 4 bytes MSG info + 1 GEC byte
+#define PPRZ_ENCRYPTED_MSG_MIN_LEN 25
+// length of the authenticated data (SOURCE ID, DEST ID)
+#define PPRZ_AUTH_LEN 2
+// index of the beginning of the ciphertext
+#define PPRZ_CIPH_IDX 7
+#else
+#if PPRZLINK_DEFAULT_VER == 1
+// minimal size of the encrypted message
+#define PPRZ_MSG_ID 1
+// index of the message ID for plaintext messages
+#define PPRZ_PLAINTEXT_MSG_ID_IDX 2
+// 2 bytes of MSG info (source_ID, msg_ID) + 1 GEC byte
+#define PPRZ_PLAINTEXT_MSG_MIN_LEN 3
+// 20 bytes crypto overhead + 2 bytes MSG info + 1 GEC byte
+#define PPRZ_ENCRYPTED_MSG_MIN_LEN 23
+// length of the authenticated data (SOURCE ID)
+#define PPRZ_AUTH_LEN 1
+// index of the beginning of the ciphertext
+#define PPRZ_CIPH_IDX 6
+#endif // PPRZLINK_DEFAULT_VER = 1
+#endif // PPRZLINK_DEFAULT_VER = 2
+
 #ifdef GEC_STATUS_LED
 #include "led.h" // for LED indication
 #endif
@@ -187,8 +217,8 @@ void gec_encapsulate_and_send_msg(struct pprzlink_msg *msg, long fd)
   get_trans(msg)->pprz_tp.trans_tx.end_message(msg, fd);
 }
 
-#else // Pprzlink 1.0
-
+#else
+#if PPRZLINK_DEFAULT_VER == 1
 void gec_encapsulate_and_send_msg(struct gec_transport *trans,
                                   struct link_device *dev, long fd);
 
@@ -279,8 +309,8 @@ static int check_available_space(
   }
   return 0;
 }
-
-#endif // PPRZLINK 2.0/1.0
+#endif // PPRZLINK_DEFAULT_VER == 1
+#endif // PPRZLINK_DEFAULT_VER == 2
 
 // Init pprz transport structure
 void gec_transport_init(struct gec_transport *t)
@@ -498,7 +528,6 @@ void gec_dl_event(void)
                        gec_tp.pprz_tp.trans_rx.payload, (bool *) &gec_tp.trans_rx.msg_received);
   // we have (CRYPTO_BYTE .. MSG_PAYLOAD) in
   if (gec_tp.trans_rx.msg_received) {  // self.rx.parse_byte(b)
-
     switch (gec_tp.sts.protocol_stage) {
       case CRYPTO_OK:
         // decrypt message