diff --git a/src/netif/lowpan6_common.c b/src/netif/lowpan6_common.c
index baea206a..4db1ebb1 100644
--- a/src/netif/lowpan6_common.c
+++ b/src/netif/lowpan6_common.c
@@ -440,7 +440,7 @@ lowpan6_decompress_hdr(u8_t *lowpan6_buffer, size_t lowpan6_bufsize,
   if ((lowpan6_buffer[0] & 0x18) == 0x00) {
     header_temp = ((lowpan6_buffer[lowpan6_offset+1] & 0x0f) << 16) | \
       (lowpan6_buffer[lowpan6_offset + 2] << 8) | lowpan6_buffer[lowpan6_offset+3];
-    LWIP_DEBUGF(LWIP_LOWPAN6_DECOMPRESSION_DEBUG, ("TF: 00, ECN: 0x%2x, Flowlabel+DSCP: 0x%8X\n", \
+    LWIP_DEBUGF(LWIP_LOWPAN6_DECOMPRESSION_DEBUG, ("TF: 00, ECN: 0x%"X8_F", Flowlabel+DSCP: 0x%8"X32_F"\n", \
       lowpan6_buffer[lowpan6_offset],header_temp));
     IP6H_VTCFL_SET(ip6hdr, 6, lowpan6_buffer[lowpan6_offset], header_temp);
     /* increase offset, processed 4 bytes here:
@@ -448,14 +448,14 @@ lowpan6_decompress_hdr(u8_t *lowpan6_buffer, size_t lowpan6_bufsize,
     lowpan6_offset += 4;
   } else if ((lowpan6_buffer[0] & 0x18) == 0x08) {
     header_temp = ((lowpan6_buffer[lowpan6_offset] & 0x0f) << 16) | (lowpan6_buffer[lowpan6_offset + 1] << 8) | lowpan6_buffer[lowpan6_offset+2];
-    LWIP_DEBUGF(LWIP_LOWPAN6_DECOMPRESSION_DEBUG, ("TF: 01, ECN: 0x%2x, Flowlabel: 0x%2X, DSCP ignored\n", \
+    LWIP_DEBUGF(LWIP_LOWPAN6_DECOMPRESSION_DEBUG, ("TF: 01, ECN: 0x%"X8_F", Flowlabel: 0x%2"X32_F", DSCP ignored\n", \
       lowpan6_buffer[lowpan6_offset] & 0xc0,header_temp));
     IP6H_VTCFL_SET(ip6hdr, 6, lowpan6_buffer[lowpan6_offset] & 0xc0, header_temp);
     /* increase offset, processed 3 bytes here:
      * TF=01:  ECN + 2-bit Pad + Flow Label (3 bytes), DSCP is elided.*/
     lowpan6_offset += 3;
   } else if ((lowpan6_buffer[0] & 0x18) == 0x10) {
-    LWIP_DEBUGF(LWIP_LOWPAN6_DECOMPRESSION_DEBUG, ("TF: 10, DCSP+ECN: 0x%2x, Flowlabel ignored\n", lowpan6_buffer[lowpan6_offset]));
+    LWIP_DEBUGF(LWIP_LOWPAN6_DECOMPRESSION_DEBUG, ("TF: 10, DCSP+ECN: 0x%"X8_F", Flowlabel ignored\n", lowpan6_buffer[lowpan6_offset]));
     IP6H_VTCFL_SET(ip6hdr, 6, lowpan6_buffer[lowpan6_offset],0);
     /* increase offset, processed 1 byte here:
      * ECN + DSCP (1 byte), Flow Label is elided.*/
@@ -564,7 +564,7 @@ lowpan6_decompress_hdr(u8_t *lowpan6_buffer, size_t lowpan6_bufsize,
 #if LWIP_6LOWPAN_NUM_CONTEXTS > 0
       ip6hdr->src.addr[0] = lowpan6_contexts[i].addr[0];
       ip6hdr->src.addr[1] = lowpan6_contexts[i].addr[1];
-      LWIP_DEBUGF(LWIP_LOWPAN6_DECOMPRESSION_DEBUG, ("SAM == xx, context compression found @%d: %8X, %8X\n", (int)i, ip6hdr->src.addr[0], ip6hdr->src.addr[1]));
+      LWIP_DEBUGF(LWIP_LOWPAN6_DECOMPRESSION_DEBUG, ("SAM == xx, context compression found @%d: %8"X32_F", %8"X32_F"\n", (int)i, ip6hdr->src.addr[0], ip6hdr->src.addr[1]));
 #else
       LWIP_UNUSED_ARG(lowpan6_contexts);
 #endif