diff --git a/tests/test-langs.rkt b/tests/test-langs.rkt
index a5b0943..a726706 100644
--- a/tests/test-langs.rkt
+++ b/tests/test-langs.rkt
@@ -1,5 +1,5 @@
 #lang racket/base
-(require rackunit racket/port racket/system)
+(require rackunit racket/port racket/system racket/runtime-path)
 
 
 (module test-default pollen
@@ -31,13 +31,16 @@
 (require (prefix-in ptree: 'test-ptree))
 (check-equal? ptree:doc '(pagetree-root (index (brother sister))))
 
-
-(define (run file)
-  (with-output-to-string (λ() (system (format "racket ~a" file)))))
-
-(module+ main
-  (check-equal? (run "test.ptree") "'(pagetree-root test ====)")
-  (check-equal? (run "test.html.pm") "'(root \"test\" \"\\n\" \"====\")")
-  (check-equal? (run "test.html.pmd") "'(root (h1 ((id \"test\")) \"test\"))")
-  (check-equal? (run "test.html.pp") "test\n====")
-  (check-equal? (run "test.no-ext") "test\n===="))
+(define (run path)
+  (with-output-to-string (λ() (system (format "racket ~a" path)))))
+
+(define-runtime-path test.ptree "test.ptree")
+(check-equal? (run test.ptree) "'(pagetree-root test ====)")
+(define-runtime-path test.html.pm "test.html.pm")
+(check-equal? (run "test.html.pm") "'(root \"test\" \"\\n\" \"====\")")
+(define-runtime-path test.html.pmd "test.html.pmd")
+(check-equal? (run "test.html.pmd") "'(root (h1 ((id \"test\")) \"test\"))")
+(define-runtime-path test.html.pp "test.html.pp")
+(check-equal? (run "test.html.pp") "test\n====")
+(define-runtime-path test.no-ext "test.no-ext")
+(check-equal? (run "test.no-ext") "test\n====")
diff --git a/tests/test-render.rkt b/tests/test-render.rkt
index 38e684d..6a12252 100644
--- a/tests/test-render.rkt
+++ b/tests/test-render.rkt
@@ -1,11 +1,12 @@
 #lang racket/base
-(require rackunit)
+(require rackunit racket/runtime-path)
 (require "../render.rkt")
 (require/expose "../render.rkt" (modification-date-hash make-mod-dates-key path->mod-date-value store-render-in-modification-dates modification-date-expired?))
 
+
 (check-pred hash? modification-date-hash)
 
-(define sample-dir (string->path "samples"))
+(define-runtime-path sample-dir "samples")
 (define samples (parameterize ([current-directory sample-dir])
                   (map path->complete-path (directory-list "."))))
 (define-values (sample-01 sample-02 sample-03) (apply values samples))