diff --git a/project.clj b/project.clj
index bcb3c35..1c0f74d 100644
--- a/project.clj
+++ b/project.clj
@@ -21,7 +21,7 @@
             [lein-autoexpect   "0.2.5"]
             [codox             "0.6.4"]]
   :min-lein-version "2.0.0"
-  :warn-on-reflection true
+  :global-vars {*warn-on-reflection* true}
   :repositories
   {"sonatype"
    {:url "http://oss.sonatype.org/content/repositories/releases"