diff --git a/collects/mzlib/shared.rkt b/collects/mzlib/shared.rkt
index 361fc01..bb6e262 100644
--- a/collects/mzlib/shared.rkt
+++ b/collects/mzlib/shared.rkt
@@ -4,6 +4,7 @@
                      syntax/stx
                      syntax/kerncase
                      syntax/struct
+                     racket/struct-info
                      scheme/include))
 
 (provide shared)