diff --git a/bin/cc-and-mkdep.all b/bin/cc-and-mkdep.all
index 1aed8acad..853916562 100755
--- a/bin/cc-and-mkdep.all
+++ b/bin/cc-and-mkdep.all
@@ -16,5 +16,5 @@ do
 			;;
 	esac
 done
-$UTIL_HOME/lib.bin/cpp -d $cpp_args > $n
+$UTIL_HOME/lib.bin/cpp -d -m $cpp_args > $n
 exec $CC $*