diff --git a/tools/sdk/lib/liblwip2-1460-feat.a b/tools/sdk/lib/liblwip2-1460-feat.a
index 3ed56d2c2d..332e8d5e31 100644
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diff --git a/tools/sdk/lib/liblwip2-1460.a b/tools/sdk/lib/liblwip2-1460.a
index 7de7fadeda..2d34e9fa40 100644
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diff --git a/tools/sdk/lib/liblwip2-536-feat.a b/tools/sdk/lib/liblwip2-536-feat.a
index 556e864256..819293bfdc 100644
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diff --git a/tools/sdk/lib/liblwip2-536.a b/tools/sdk/lib/liblwip2-536.a
index f9ece4cea5..28eb3ecd20 100644
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diff --git a/tools/sdk/lib/liblwip6-1460-feat.a b/tools/sdk/lib/liblwip6-1460-feat.a
index f50d97d2ad..efb5d24dc5 100644
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diff --git a/tools/sdk/lib/liblwip6-536-feat.a b/tools/sdk/lib/liblwip6-536-feat.a
index fae8152112..f4a2a7ecb4 100644
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diff --git a/tools/sdk/lwip2/builder b/tools/sdk/lwip2/builder
index 66f84a603e..b5def382d6 160000
--- a/tools/sdk/lwip2/builder
+++ b/tools/sdk/lwip2/builder
@@ -1 +1 @@
-Subproject commit 66f84a603ee3070467f119b5e2be5209ec22351f
+Subproject commit b5def382d6ec666dc423611d09f137aa45147f25
diff --git a/tools/sdk/lwip2/include/lwip-git-hash.h b/tools/sdk/lwip2/include/lwip-git-hash.h
index fe8698cbf2..f5e25bf234 100644
--- a/tools/sdk/lwip2/include/lwip-git-hash.h
+++ b/tools/sdk/lwip2/include/lwip-git-hash.h
@@ -1,5 +1,5 @@
 // generated by makefiles/make-lwip2-hash
 #ifndef LWIP_HASH_H
 #define LWIP_HASH_H
-#define LWIP_HASH_STR "STABLE-2_1_3_RELEASE/glue:1.2-61-g679577b"
+#define LWIP_HASH_STR "STABLE-2_1_3_RELEASE/glue:1.2-63-gb5def38"
 #endif // LWIP_HASH_H
diff --git a/tools/sdk/lwip2/include/lwip/arch.h b/tools/sdk/lwip2/include/lwip/arch.h
index 16add89824..58dae33aa1 100644
--- a/tools/sdk/lwip2/include/lwip/arch.h
+++ b/tools/sdk/lwip2/include/lwip/arch.h
@@ -190,7 +190,7 @@ typedef uintptr_t mem_ptr_t;
  * sys/types or unistd.h are available).
  * Being like that, we define it to 'int' if SSIZE_MAX is not defined.
  */
-#if !defined(SSIZE_MAX) || !defined(_SSIZE_T_DECLARED)
+#ifdef SSIZE_MAX
 /* If SSIZE_MAX is defined, unistd.h should provide the type as well */
 #ifndef LWIP_NO_UNISTD_H
 #define LWIP_NO_UNISTD_H 0