diff --git a/core/net/llsec/noncoresec/noncoresec.c b/core/net/llsec/noncoresec/noncoresec.c
index 71a1cb82a..f9d442651 100644
--- a/core/net/llsec/noncoresec/noncoresec.c
+++ b/core/net/llsec/noncoresec/noncoresec.c
@@ -195,7 +195,7 @@ parse(void)
   packetbuf_set_datalen(packetbuf_datalen() - MIC_LEN);
   
   if(!aead(result, 0)) {
-    PRINTF("noncoresec: received unauthentic frame %"PRIu32"\n",
+    PRINTF("noncoresec: received unauthentic frame %lu\n",
         anti_replay_get_counter());
     return FRAMER_FAILED;
   }
@@ -228,7 +228,7 @@ parse(void)
     anti_replay_init_info(info);
   } else {
     if(anti_replay_was_replayed(info)) {
-       PRINTF("noncoresec: received replayed frame %"PRIu32"\n",
+       PRINTF("noncoresec: received replayed frame %lu\n",
            anti_replay_get_counter());
        return FRAMER_FAILED;
     }
diff --git a/cpu/cc2538/dev/aes.c b/cpu/cc2538/dev/aes.c
index 429def67b..2b9e11a17 100644
--- a/cpu/cc2538/dev/aes.c
+++ b/cpu/cc2538/dev/aes.c
@@ -226,12 +226,14 @@ aes_auth_crypt_start(uint32_t ctrl, uint8_t key_area, const void *iv,
         REG(AES_CTRL_ALG_SEL) = 0x00000000;
         return CRYPTO_DMA_BUS_ERROR;
       }
+
+      /* Clear interrupt status */
+      REG(AES_CTRL_INT_CLR) = AES_CTRL_INT_CLR_DMA_IN_DONE;
     }
   }
 
-  /* Clear interrupt status */
-  REG(AES_CTRL_INT_CLR) = AES_CTRL_INT_CLR_DMA_IN_DONE |
-                          AES_CTRL_INT_CLR_RESULT_AV;
+  /* Enable result available bit in interrupt enable */
+  REG(AES_CTRL_INT_EN) = AES_CTRL_INT_EN_RESULT_AV;
 
   if(process != NULL) {
     crypto_register_process_notification(process);
@@ -239,9 +241,6 @@ aes_auth_crypt_start(uint32_t ctrl, uint8_t key_area, const void *iv,
     nvic_interrupt_enable(NVIC_INT_AES);
   }
 
-  /* Enable result available bit in interrupt enable */
-  REG(AES_CTRL_INT_EN) = AES_CTRL_INT_EN_RESULT_AV;
-
   if(data_len != 0) {
     /* Configure DMAC
      * Enable DMA channel 0 */