diff --git a/collects/planet/private/version.rkt b/collects/planet/private/version.rkt
index ff9db78a2a..8190c375df 100644
--- a/collects/planet/private/version.rkt
+++ b/collects/planet/private/version.rkt
@@ -2,6 +2,7 @@
 (require (for-syntax syntax/parse)
          unstable/syntax
          racket/syntax
+         mzlib/etc
          "../planet-archives.rkt")
 
 (provide this-package-version