diff --git a/ring-devel/src/ring/middleware/stacktrace.clj b/ring-devel/src/ring/middleware/stacktrace.clj
index a17c30b..062d511 100644
--- a/ring-devel/src/ring/middleware/stacktrace.clj
+++ b/ring-devel/src/ring/middleware/stacktrace.clj
@@ -87,6 +87,3 @@
   (-> handler
       wrap-stacktrace-log
       wrap-stacktrace-web))
-
-(def ^{:private true} css "
-")