diff --git a/src/core/tcp_in.c b/src/core/tcp_in.c
index c618e006..dd88e1e5 100644
--- a/src/core/tcp_in.c
+++ b/src/core/tcp_in.c
@@ -55,7 +55,6 @@
 #include "lwip/stats.h"
 #include "lwip/ip6.h"
 #include "lwip/ip6_addr.h"
-#include "lwip/inet_chksum.h"
 #if LWIP_ND6_TCP_REACHABILITY_HINTS
 #include "lwip/nd6.h"
 #endif /* LWIP_ND6_TCP_REACHABILITY_HINTS */
diff --git a/src/core/tcp_out.c b/src/core/tcp_out.c
index 7e1803fe..70bdfea5 100644
--- a/src/core/tcp_out.c
+++ b/src/core/tcp_out.c
@@ -52,7 +52,6 @@
 #include "lwip/stats.h"
 #include "lwip/ip6.h"
 #include "lwip/ip6_addr.h"
-#include "lwip/inet_chksum.h"
 #if LWIP_TCP_TIMESTAMPS
 #include "lwip/sys.h"
 #endif
diff --git a/src/core/udp.c b/src/core/udp.c
index 60d3f4a6..20e97da6 100644
--- a/src/core/udp.c
+++ b/src/core/udp.c
@@ -56,7 +56,6 @@
 #include "lwip/ip_addr.h"
 #include "lwip/ip6.h"
 #include "lwip/ip6_addr.h"
-#include "lwip/inet_chksum.h"
 #include "lwip/netif.h"
 #include "lwip/icmp.h"
 #include "lwip/icmp6.h"