diff --git a/src/include/lwip/errno.h b/src/include/lwip/errno.h
index 20e43759..641cffb0 100644
--- a/src/include/lwip/errno.h
+++ b/src/include/lwip/errno.h
@@ -43,7 +43,7 @@
 extern "C" {
 #endif
 
-#if LWIP_PROVIDE_ERRNO
+#ifdef LWIP_PROVIDE_ERRNO
 
 #define  EPERM            1  /* Operation not permitted */
 #define  ENOENT           2  /* No such file or directory */
diff --git a/src/include/lwip/opt.h b/src/include/lwip/opt.h
index fd779c67..99511984 100644
--- a/src/include/lwip/opt.h
+++ b/src/include/lwip/opt.h
@@ -1751,14 +1751,6 @@
 #define LWIP_SOCKET_SET_ERRNO           1
 #endif
 
-/** LWIP_PROVIDE_ERRNO==1: Let lwIP provide ERRNO values and the 'errno' variable.
- * If this is disabled, cc.h must either define 'errno', include <errno.h> or
- * define LWIP_ERRNO_INCLUDE to <errno.h> or equivalent.
- */
-#if !defined LWIP_PROVIDE_ERRNO || defined __DOXYGEN__
-#define LWIP_PROVIDE_ERRNO              0
-#endif
-
 /**
  * LWIP_COMPAT_SOCKETS==1: Enable BSD-style sockets functions names through defines.
  * LWIP_COMPAT_SOCKETS==2: Same as ==1 but correctly named functions are created.