diff --git a/libc/upstream-netbsd/port_before.h b/libc/upstream-netbsd/port_before.h
index 70eed26..9f77f79 100644
--- a/libc/upstream-netbsd/port_before.h
+++ b/libc/upstream-netbsd/port_before.h
@@ -21,7 +21,7 @@
 #include <sys/cdefs.h>
 #include <arpa_nameser.h>
 
-#define ISC_FORMAT_PRINTF(a,b) __attribute__((__format__(__printf__,a,b)))
+#define ISC_FORMAT_PRINTF(a,b) __printflike(a,b)
 #define ISC_SOCKLEN_T socklen_t
 
 #endif