diff --git a/src/include/lwip/opt.h b/src/include/lwip/opt.h
index 59c1754c..8227a529 100644
--- a/src/include/lwip/opt.h
+++ b/src/include/lwip/opt.h
@@ -49,18 +49,6 @@
 #define SYS_LIGHTWEIGHT_PROT           0
 #endif
 
-#ifndef SYS_ARCH_DECL_PROTECT
-#define SYS_ARCH_DECL_PROTECT(lock)
-#endif
-
-#ifndef SYS_ARCH_PROTECT
-#define SYS_ARCH_PROTECT(lock)
-#endif
-
-#ifndef SYS_ARCH_UNPROTECT
-#define SYS_ARCH_UNPROTECT(lock)
-#endif
-
 #ifndef NO_SYS
 #define NO_SYS 0
 #endif
@@ -298,7 +286,7 @@ a lot of data that needs to be copied, this should be set high. */
 #endif 
 
 #ifndef LWIP_COMPAT_SOCKETS
-#define LWIP_COMPAT_SOCKETS	1
+#define LWIP_COMPAT_SOCKETS     1
 #endif
 
 /* ---------- Statistics options ---------- */
@@ -319,7 +307,7 @@ a lot of data that needs to be copied, this should be set high. */
 /* Debugging options all default to off */
 
 #ifndef DEMO_DEBUG
-#define DEMO_DEBUG	DBG_OFF
+#define DEMO_DEBUG      DBG_OFF
 #endif
 
 #ifndef ETHARP_DEBUG
diff --git a/src/include/lwip/sys.h b/src/include/lwip/sys.h
index 753fcadc..794f38f5 100644
--- a/src/include/lwip/sys.h
+++ b/src/include/lwip/sys.h
@@ -122,7 +122,7 @@ void sys_mbox_fetch(sys_mbox_t mbox, void **msg);
  * for certain critical regions during buffer allocation, deallocation and memory
  * allocation and deallocation.
  */
-#ifdef SYS_LIGHTWEIGHT_PROT
+#if SYS_LIGHTWEIGHT_PROT
 
 /** SYS_ARCH_DECL_PROTECT
  * declare a protection variable. This macro will default to defining a variable of