diff --git a/bin/test/test.c b/bin/test/test.c
index bf33ac2f61d4..caeb79809ee7 100644
--- a/bin/test/test.c
+++ b/bin/test/test.c
@@ -34,7 +34,8 @@ static const char rcsid[] =
 #else
 #include <locale.h>
 
-static void error(const char *, ...) __attribute__((__noreturn__));
+static void error(const char *, ...) __attribute__((__noreturn__))
+	__printflike(1, 2);
 
 static void
 error(const char *msg, ...)