diff --git a/pitfall/pitfall/main.rkt b/pitfall/pitfall/main.rkt
index 0f79b1b2..0ba84d38 100644
--- a/pitfall/pitfall/main.rkt
+++ b/pitfall/pitfall/main.rkt
@@ -1,11 +1,13 @@
 #lang racket/base
-(require "pdf.rkt"
+(require "core.rkt"
+         "pdf.rkt"
          "text.rkt"
          "font.rkt"
          "color.rkt"
          "vector.rkt")
-(provide (all-from-out "pdf.rkt"
-                       "text.rkt"
-                       "font.rkt"
-                       "color.rkt"
-                       "vector.rkt"))
\ No newline at end of file
+(provide (all-from-out  "core.rkt"
+                        "pdf.rkt"
+                        "text.rkt"
+                        "font.rkt"
+                        "color.rkt"
+                        "vector.rkt"))
\ No newline at end of file