diff --git a/sass/main.rkt b/sass/main.rkt
index 386fc49..9a85603 100644
--- a/sass/main.rkt
+++ b/sass/main.rkt
@@ -29,7 +29,7 @@
   (for ([path (reverse (current-include-paths))])
     ;; Unlike sass_make_data_context, this function does not take
     ;; ownership of path.  Cool.
-    (sass_option_push_include_path options path)))
+    (sass_option_push_include_path options (path->complete-path path))))
 
 (define ((make-compiler #:constructor make-wrapper
                         #:destructor free-wrapper
diff --git a/sass/private/libsass.rkt b/sass/private/libsass.rkt
index 949e6dd..d67dbd1 100644
--- a/sass/private/libsass.rkt
+++ b/sass/private/libsass.rkt
@@ -43,7 +43,7 @@
 ;; Sass_Options ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 
 (define _Sass_Options-pointer (_cpointer 'Sass_Options))
-(define-sass sass_option_push_include_path (_fun _Sass_Options-pointer _string -> _void))
+(define-sass sass_option_push_include_path (_fun _Sass_Options-pointer _path -> _void))
 
 
 ;; Sass_Context ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;