diff --git a/cover/private/raw.rkt b/cover/private/raw.rkt
index ae3780a..4d324e8 100644
--- a/cover/private/raw.rkt
+++ b/cover/private/raw.rkt
@@ -1,7 +1,8 @@
 #lang racket/base
-(require racket/pretty "../cover.rkt")
+(require racket/pretty racket/file "../cover.rkt")
 (provide generate-raw-coverage)
 (define (generate-raw-coverage coverage files [dir "coverage"])
+  (make-directory* dir)
   (with-output-to-file (build-path dir "coverage.rktl")
     #:exists 'replace
     (lambda () (pretty-write (coverage-wrapper-map coverage)))))