diff --git a/os/lib/aes-128.c b/os/lib/aes-128.c
index 98e115c3f..3b0082e7c 100644
--- a/os/lib/aes-128.c
+++ b/os/lib/aes-128.c
@@ -166,16 +166,6 @@ encrypt(uint8_t *state)
   }
 }
 /*---------------------------------------------------------------------------*/
-void
-aes_128_set_padded_key(uint8_t *key, uint8_t key_len)
-{
-  uint8_t block[AES_128_BLOCK_SIZE];
-  
-  memset(block, 0, AES_128_BLOCK_SIZE);
-  memcpy(block, key, key_len);
-  AES_128.set_key(block);
-}
-/*---------------------------------------------------------------------------*/
 const struct aes_128_driver aes_128_driver = {
   set_key,
   encrypt
diff --git a/os/lib/aes-128.h b/os/lib/aes-128.h
index 458b93915..e003c2b25 100644
--- a/os/lib/aes-128.h
+++ b/os/lib/aes-128.h
@@ -67,11 +67,6 @@ struct aes_128_driver {
   void (* encrypt)(uint8_t *plaintext_and_result);
 };
 
-/**
- * \brief Pads the key with zeroes before calling AES_128.set_key
- */
-void aes_128_set_padded_key(uint8_t *key, uint8_t key_len);
-
 extern const struct aes_128_driver AES_128;
 
 #endif /* AES_128_H_ */
diff --git a/os/net/linkaddr.h b/os/net/linkaddr.h
index 6f7380218..7926550b1 100644
--- a/os/net/linkaddr.h
+++ b/os/net/linkaddr.h
@@ -70,11 +70,6 @@ typedef union {
 #endif /* LINKADDR_SIZE == 2 */
 } linkaddr_t;
 
-typedef union {
-  uint8_t u8[8];
-  uint16_t u16[4];
-} linkaddr_extended_t;
-
 /**
  * \brief      Copy a link-layer address
  * \param dest The destination
diff --git a/os/net/mac/framer/framer-802154.c b/os/net/mac/framer/framer-802154.c
index 7122c5ccd..b4c24da19 100644
--- a/os/net/mac/framer/framer-802154.c
+++ b/os/net/mac/framer/framer-802154.c
@@ -171,7 +171,6 @@ framer_802154_setup_params(packetbuf_attr_t (*get_attr)(uint8_t type),
 #if LLSEC802154_USES_EXPLICIT_KEYS
   params->aux_hdr.security_control.key_id_mode = get_attr(PACKETBUF_ATTR_KEY_ID_MODE);
   params->aux_hdr.key_index = get_attr(PACKETBUF_ATTR_KEY_INDEX);
-  params->aux_hdr.key_source.u16[0] = get_attr(PACKETBUF_ATTR_KEY_SOURCE_BYTES_0_1);
 #endif /* LLSEC802154_USES_EXPLICIT_KEYS */
 #else
   params->fcf.security_enabled = 0;
@@ -273,7 +272,6 @@ parse(void)
 #if LLSEC802154_USES_EXPLICIT_KEYS
       packetbuf_set_attr(PACKETBUF_ATTR_KEY_ID_MODE, frame.aux_hdr.security_control.key_id_mode);
       packetbuf_set_attr(PACKETBUF_ATTR_KEY_INDEX, frame.aux_hdr.key_index);
-      packetbuf_set_attr(PACKETBUF_ATTR_KEY_SOURCE_BYTES_0_1, frame.aux_hdr.key_source.u16[0]);
 #endif /* LLSEC802154_USES_EXPLICIT_KEYS */
     }
 #endif /* LLSEC802154_USES_AUX_HEADER */
diff --git a/os/net/packetbuf.h b/os/net/packetbuf.h
index 39ce4a467..20e071474 100644
--- a/os/net/packetbuf.h
+++ b/os/net/packetbuf.h
@@ -236,7 +236,6 @@ enum {
 #if LLSEC802154_USES_EXPLICIT_KEYS
   PACKETBUF_ATTR_KEY_ID_MODE,
   PACKETBUF_ATTR_KEY_INDEX,
-  PACKETBUF_ATTR_KEY_SOURCE_BYTES_0_1,
 #endif /* LLSEC802154_USES_EXPLICIT_KEYS */
 
   /* Scope 2 attributes: used between end-to-end nodes. */