diff --git a/src/include/ipv4/lwip/icmp.h b/src/include/ipv4/lwip/icmp.h
index c73961c9..d47a7d8a 100644
--- a/src/include/ipv4/lwip/icmp.h
+++ b/src/include/ipv4/lwip/icmp.h
@@ -41,29 +41,29 @@
 extern "C" {
 #endif
 
-#define ICMP_ER 0      /* echo reply */
-#define ICMP_DUR 3     /* destination unreachable */
-#define ICMP_SQ 4      /* source quench */
-#define ICMP_RD 5      /* redirect */
+#define ICMP_ER   0    /* echo reply */
+#define ICMP_DUR  3    /* destination unreachable */
+#define ICMP_SQ   4    /* source quench */
+#define ICMP_RD   5    /* redirect */
 #define ICMP_ECHO 8    /* echo */
-#define ICMP_TE 11     /* time exceeded */
-#define ICMP_PP 12     /* parameter problem */
-#define ICMP_TS 13     /* timestamp */
+#define ICMP_TE  11    /* time exceeded */
+#define ICMP_PP  12    /* parameter problem */
+#define ICMP_TS  13    /* timestamp */
 #define ICMP_TSR 14    /* timestamp reply */
 #define ICMP_IRQ 15    /* information request */
-#define ICMP_IR 16     /* information reply */
+#define ICMP_IR  16    /* information reply */
 
 enum icmp_dur_type {
-  ICMP_DUR_NET = 0,    /* net unreachable */
-  ICMP_DUR_HOST = 1,   /* host unreachable */
+  ICMP_DUR_NET   = 0,  /* net unreachable */
+  ICMP_DUR_HOST  = 1,  /* host unreachable */
   ICMP_DUR_PROTO = 2,  /* protocol unreachable */
-  ICMP_DUR_PORT = 3,   /* port unreachable */
-  ICMP_DUR_FRAG = 4,   /* fragmentation needed and DF set */
-  ICMP_DUR_SR = 5      /* source route failed */
+  ICMP_DUR_PORT  = 3,  /* port unreachable */
+  ICMP_DUR_FRAG  = 4,  /* fragmentation needed and DF set */
+  ICMP_DUR_SR    = 5   /* source route failed */
 };
 
 enum icmp_te_type {
-  ICMP_TE_TTL = 0,     /* time to live exceeded in transit */
+  ICMP_TE_TTL  = 0,    /* time to live exceeded in transit */
   ICMP_TE_FRAG = 1     /* fragment reassembly time exceeded */
 };