diff --git a/src/include/ipv4/lwip/ip4_addr.h b/src/include/ipv4/lwip/ip4_addr.h
index b05ae537..923d4b06 100644
--- a/src/include/ipv4/lwip/ip4_addr.h
+++ b/src/include/ipv4/lwip/ip4_addr.h
@@ -210,7 +210,7 @@ u8_t ip4_addr_netmask_valid(u32_t netmask);
 #define ip_addr_islinklocal(addr1) (((addr1)->addr & PP_HTONL(0xffff0000UL)) == PP_HTONL(0xa9fe0000UL))
 
 #define ip_addr_debug_print(debug, ipaddr) \
-  LWIP_DEBUGF(debug, ("%"U16_F".%"U16_F".%"U16_F".%"U16_F,             \
+  LWIP_DEBUGF(debug, ("%" U16_F ".%" U16_F ".%" U16_F ".%" U16_F,      \
                       ipaddr != NULL ? ip4_addr1_16(ipaddr) : 0,       \
                       ipaddr != NULL ? ip4_addr2_16(ipaddr) : 0,       \
                       ipaddr != NULL ? ip4_addr3_16(ipaddr) : 0,       \
diff --git a/src/include/ipv6/lwip/ip6_addr.h b/src/include/ipv6/lwip/ip6_addr.h
index 860861b1..1990e93e 100644
--- a/src/include/ipv6/lwip/ip6_addr.h
+++ b/src/include/ipv6/lwip/ip6_addr.h
@@ -264,7 +264,7 @@ Little-endian version, stored in network order (no htonl). */
 #define ip6_addr_isdeprecated(addr_state) (addr_state == IP6_ADDR_DEPRECATED)
 
 #define ip6_addr_debug_print(debug, ipaddr) \
-  LWIP_DEBUGF(debug, ("%"X16_F":%"X16_F":%"X16_F":%"X16_F":%"X16_F":%"X16_F":%"X16_F":%"X16_F, \
+  LWIP_DEBUGF(debug, ("%" X16_F ":%" X16_F ":%" X16_F ":%" X16_F ":%" X16_F ":%" X16_F ":%" X16_F ":%" X16_F, \
                       ipaddr != NULL ? IP6_ADDR_BLOCK1(ipaddr) : 0,    \
                       ipaddr != NULL ? IP6_ADDR_BLOCK2(ipaddr) : 0,    \
                       ipaddr != NULL ? IP6_ADDR_BLOCK3(ipaddr) : 0,    \