diff --git a/sys/sys/_stdarg.h b/sys/sys/_stdarg.h
index 69c06b91e93..396c888070f 100644
--- a/sys/sys/_stdarg.h
+++ b/sys/sys/_stdarg.h
@@ -43,13 +43,13 @@
 #endif
 
 #ifdef __GNUCLIKE_BUILTIN_STDARG
-  #define va_start(ap, last) __builtin_va_start((ap), (last))
-  #define va_arg(ap, type) __builtin_va_arg((ap), type)
-  #define __va_copy(dest, src) __builtin_va_copy((dest), (src))
+  #define	va_start(ap, last)	__builtin_va_start((ap), (last))
+  #define	va_arg(ap, type)	__builtin_va_arg((ap), type)
+  #define	__va_copy(dest, src)	__builtin_va_copy((dest), (src))
   #if __ISO_C_VISIBLE >= 1999
-    #define va_copy(dest, src) __va_copy(dest, src)
+    #define	va_copy(dest, src)	__va_copy(dest, src)
   #endif
-#define va_end(ap) __builtin_va_end(ap)
+  #define	va_end(ap)		__builtin_va_end(ap)
 #endif
 
 #if defined(lint) && !defined(va_start)