diff --git a/examples/postcard.modal b/examples/postcard.modal
index 478b784..ffa521d 100644
--- a/examples/postcard.modal
+++ b/examples/postcard.modal
@@ -1,4 +1,3 @@
-
 <> (what is ?x) (is ?x a (programming language))
 <> (is ?x a ?y) (or, is ?x (a virtual machine))
 <> (or, is ?x ?y) (?x is ?y <> ?y (a meta-language))
@@ -6,4 +5,3 @@
 <> (?x is ?x) (?(?: ?:) ?x)
 
 what is modal
-
diff --git a/src/modal.c b/src/modal.c
index c7bc1a4..1cb3d72 100644
--- a/src/modal.c
+++ b/src/modal.c
@@ -210,10 +210,10 @@ echo_rule(Rule *r, char *field)
 	char c, *s = field;
 	putc('(', stdout);
 	while((c = *s++)) {
-		int rid;
+		unsigned int rid;
 		putc(c, stdout);
 		if(c == '?')
-			c = *s++, rid = c - '0', putc(rid < 8 ? r->reg[rid] : c, stdout);
+			c = *s++, rid = c - '0', putc(rid < 9 ? r->reg[rid] : c, stdout);
 	}
 	putc(')', stdout), putc(' ', stdout);
 }