diff --git a/src/core/ipv4/icmp.c b/src/core/ipv4/icmp.c
index 3c9445de..3fe13cc3 100644
--- a/src/core/ipv4/icmp.c
+++ b/src/core/ipv4/icmp.c
@@ -57,7 +57,7 @@
 
 /** Small optimization: set to 0 if incoming PBUF_POOL pbuf always can be
  * used to modify and send a response packet (and to 1 if this is not the case,
- * e.g. when link header is stripped of when receiving) */
+ * e.g. when link header is stripped off when receiving) */
 #ifndef LWIP_ICMP_ECHO_CHECK_INPUT_PBUF_LEN
 #define LWIP_ICMP_ECHO_CHECK_INPUT_PBUF_LEN 1
 #endif /* LWIP_ICMP_ECHO_CHECK_INPUT_PBUF_LEN */