Index: write.c
===================================================================
--- write.c	(revision 38499)
+++ write.c	(revision 38500)
@@ -1488,7 +1488,7 @@
 		tmp.used = 0;
 
 		if ((e->key.left == '-') || glyph_non_printable(e->key.left))
-			rnd_append_printf(&tmp, "&%d", e->key.left);
+			rnd_append_printf(&tmp, "&%02x", e->key.left);
 		else
 			gds_append(&tmp, e->key.left);
 
@@ -1495,7 +1495,7 @@
 		gds_append(&tmp, '-');
 
 		if ((e->key.right == '-') || glyph_non_printable(e->key.right))
-			rnd_append_printf(&tmp, "&%d", e->key.right);
+			rnd_append_printf(&tmp, "&%02x", e->key.right);
 		else
 			gds_append(&tmp, e->key.right);