diff --git a/newlib/libc/include/sys/cdefs.h b/newlib/libc/include/sys/cdefs.h
index b3508f3a9..720e70092 100644
--- a/newlib/libc/include/sys/cdefs.h
+++ b/newlib/libc/include/sys/cdefs.h
@@ -122,16 +122,12 @@
 #define	__GNUCLIKE_BUILTIN_VAALIST 1
 #endif
 
-#if defined(__GNUC__)
 #define	__GNUC_VA_LIST_COMPATIBILITY 1
-#endif
 
 /*
  * Compiler memory barriers, specific to gcc and clang.
  */
-#if defined(__GNUC__)
 #define	__compiler_membar()	__asm __volatile(" " : : : "memory")
-#endif
 
 #define	__GNUCLIKE_BUILTIN_NEXT_ARG 1
 #define	__GNUCLIKE_MATH_BUILTIN_RELOPS