diff --git a/pandoc/pandoc.r5rs.scm b/pandoc/pandoc.r5rs.scm
index 1e29c4f..89c5249 100644
--- a/pandoc/pandoc.r5rs.scm
+++ b/pandoc/pandoc.r5rs.scm
@@ -1,18 +1,15 @@
-(define (join-adjacent type? type-append list)
+(define (join-adjacent-strings list)
   (let loop ((new-list '()) (list list))
     (if (null? list) (reverse new-list)
         (loop (if (and (not (null? new-list))
-                       (type? (car new-list))
-                       (type? (car list)))
-                  (cons (type-append (car new-list)
-                                     (car list))
+                       (string? (car new-list))
+                       (string? (car list)))
+                  (cons (string-append (car new-list)
+                                       (car list))
                         (cdr new-list))
                   (cons (car list) new-list))
               (cdr list)))))
 
-(define (join-adjacent-strings list)
-  (join-adjacent string? string-append list))
-
 (define (vector-refs vec . indexes)
   (let loop ((obj vec) (indexes indexes))
     (if (null? indexes) obj