diff --git a/lib/krb5/error_string.c b/lib/krb5/error_string.c
index c73a26815..829c080a5 100644
--- a/lib/krb5/error_string.c
+++ b/lib/krb5/error_string.c
@@ -33,7 +33,7 @@
 
 #include "krb5_locl.h"
 
-#undef __attribute__(x)
+#undef __attribute__
 #define __attribute__(x)
 
 /**