diff --git a/configure.in b/configure.in
index 36a017026..e6d822f83 100644
--- a/configure.in
+++ b/configure.in
@@ -125,10 +125,10 @@ if test "$with_krb4" != "no"; then
 	AC_FIND_FUNC(krb_get_our_ip_for_realm)
 	AC_CACHE_CHECK(for krb_mk_req with const arguments,
 		ac_cv_func_krb_mk_req_const,
-		[AC_TRY_COMPILE([#include <krb.h>],[
+		[AC_TRY_COMPILE([#include <krb.h>
 		int krb_mk_req(KTEXT a, const char *s, const char *i,
 			       const char *r, int32_t checksum)
-		{ return 17; }],
+		{ return 17; }], [],
 		ac_cv_func_krb_mk_req_const=yes,
 		ac_cv_func_krb_mk_req_const=no)
 	])