diff --git a/newlib/libc/include/errno.h b/newlib/libc/include/errno.h
index 7c14597b2..81eaef710 100644
--- a/newlib/libc/include/errno.h
+++ b/newlib/libc/include/errno.h
@@ -2,7 +2,6 @@
 #define __ERRNO_H__
 
 typedef int error_t;
-#define __error_t_defined
 
 #include <sys/errno.h>