diff --git a/libs/library-util.scm b/libs/library-util.scm
index c403c42..3e2d44d 100644
--- a/libs/library-util.scm
+++ b/libs/library-util.scm
@@ -41,7 +41,9 @@
   (lambda (result implementation rest)
     (cond ((null? rest) result)
           ((equal? (car rest) 'import) (cdr rest))
-          ((member 'cond-expand (car rest))
+          ((or (member 'cond-expand (car rest))
+               (member 'prefix (car rest))
+               (member 'except (car rest)))
            (if (assoc implementation (cdr (car rest)))
              (get-imports result
                           implementation