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 80e9007459..251de66978 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 8888995bcc..ea6a5ff755 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 61086b96d3..49c7541ed7 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 */