diff --git a/components/net/lwip-1.4.1/src/arch/include/arch/cc.h b/components/net/lwip-1.4.1/src/arch/include/arch/cc.h
index 80e90074595b861b66c3cfa20e14617f074d7faf..251de6697899dc03a93e7aa55302c1eacad4994c 100644
--- a/components/net/lwip-1.4.1/src/arch/include/arch/cc.h
+++ b/components/net/lwip-1.4.1/src/arch/include/arch/cc.h
@@ -84,9 +84,9 @@ typedef uintptr_t mem_ptr_t;
 #define PACK_STRUCT_BEGIN
 #define PACK_STRUCT_END
 #elif defined(__IAR_SYSTEMS_ICC__)   /* IAR Compiler */
-#define PACK_STRUCT_BEGIN   #pragma pack(1)
-#define PACK_STRUCT_STRUCT 
-#define PACK_STRUCT_END     #pragma pack()
+#define PACK_STRUCT_BEGIN
+#define PACK_STRUCT_STRUCT
+#define PACK_STRUCT_END
 #define PACK_STRUCT_FIELD(x) x
 #define PACK_STRUCT_USE_INCLUDES
 #elif defined(__GNUC__)     /* GNU GCC Compiler */
diff --git a/components/net/lwip-2.0.2/src/arch/include/arch/cc.h b/components/net/lwip-2.0.2/src/arch/include/arch/cc.h
index 8888995bcc860cb35b8c0eead646efa2b4706a6e..ea6a5ff75585f9aab3750e4dc0ad53a6a9d9cec0 100644
--- a/components/net/lwip-2.0.2/src/arch/include/arch/cc.h
+++ b/components/net/lwip-2.0.2/src/arch/include/arch/cc.h
@@ -63,9 +63,9 @@
 #define PACK_STRUCT_BEGIN
 #define PACK_STRUCT_END
 #elif defined(__IAR_SYSTEMS_ICC__)   /* IAR Compiler */
-#define PACK_STRUCT_BEGIN   #pragma pack(1)
+#define PACK_STRUCT_BEGIN
 #define PACK_STRUCT_STRUCT
-#define PACK_STRUCT_END     #pragma pack()
+#define PACK_STRUCT_END
 #define PACK_STRUCT_FIELD(x) x
 #define PACK_STRUCT_USE_INCLUDES
 #elif defined(__GNUC__)     /* GNU GCC Compiler */
diff --git a/components/net/lwip-2.1.2/src/arch/include/arch/cc.h b/components/net/lwip-2.1.2/src/arch/include/arch/cc.h
index 61086b96d3aca7c0713fa3e587a5fe70ccfabd5d..49c7541ed773e07e9cfb6c19d1290e879772ac00 100644
--- a/components/net/lwip-2.1.2/src/arch/include/arch/cc.h
+++ b/components/net/lwip-2.1.2/src/arch/include/arch/cc.h
@@ -77,9 +77,9 @@
 #define PACK_STRUCT_BEGIN
 #define PACK_STRUCT_END
 #elif defined(__IAR_SYSTEMS_ICC__)   /* IAR Compiler */
-#define PACK_STRUCT_BEGIN   #pragma pack(1)
+#define PACK_STRUCT_BEGIN
 #define PACK_STRUCT_STRUCT
-#define PACK_STRUCT_END     #pragma pack()
+#define PACK_STRUCT_END
 #define PACK_STRUCT_FIELD(x) x
 #define PACK_STRUCT_USE_INCLUDES
 #elif defined(__GNUC__)     /* GNU GCC Compiler */