diff --git a/src/include/lwip/tcp_impl.h b/src/include/lwip/tcp_impl.h
index a718fb0c..fd1c5882 100644
--- a/src/include/lwip/tcp_impl.h
+++ b/src/include/lwip/tcp_impl.h
@@ -260,7 +260,7 @@ PACK_STRUCT_END
 #define TCP_OVERSIZE_DBGCHECK 0
 #endif
 
-/** Don't generate chceksum on copy if CHECKSUM_GEN_TCP is disabled */
+/** Don't generate checksum on copy if CHECKSUM_GEN_TCP is disabled */
 #define TCP_CHECKSUM_ON_COPY  (LWIP_CHECKSUM_ON_COPY && CHECKSUM_GEN_TCP)
 
 /* This structure represents a TCP segment on the unsent, unacked and ooseq queues */