diff --git a/cf/db.m4 b/cf/db.m4
index f5f52ed1d..8a6c632eb 100644
--- a/cf/db.m4
+++ b/cf/db.m4
@@ -175,7 +175,7 @@ if test "$have_ndbm" = "yes"; then
 #elif defined(HAVE_DBM_H)
 #include <dbm.h>
 #endif
-int main()
+int main(int argc, char **argv)
 {
   DBM *d;
 
diff --git a/cf/krb-bigendian.m4 b/cf/krb-bigendian.m4
index 185570720..62af3ffdf 100644
--- a/cf/krb-bigendian.m4
+++ b/cf/krb-bigendian.m4
@@ -31,7 +31,7 @@ AC_CACHE_CHECK(whether byte ordering is bigendian, krb_cv_c_bigendian,[
   not big endian
 #endif]])],[krb_cv_c_bigendian=yes],[krb_cv_c_bigendian=no])
   else
-    AC_RUN_IFELSE([AC_LANG_SOURCE([[main () {
+    AC_RUN_IFELSE([AC_LANG_SOURCE([[main (int argc, char **argv) {
       /* Are we little or big endian?  From Harbison&Steele.  */
       union
       {