diff --git a/modules/logging/src/main/clojure/clojure/contrib/logging.clj b/modules/logging/src/main/clojure/clojure/contrib/logging.clj
index 99648a9e..9479f1ef 100644
--- a/modules/logging/src/main/clojure/clojure/contrib/logging.clj
+++ b/modules/logging/src/main/clojure/clojure/contrib/logging.clj
@@ -490,5 +490,6 @@
   to obtain an instance satisfying the Log protocol. Defaults to the value
   returned from find-factory. Can be rebound to provide alternate logging
   implementations"}
+  ^:dynamic
   *log-factory*
   (find-factory))
diff --git a/modules/trace/src/main/clojure/clojure/contrib/trace.clj b/modules/trace/src/main/clojure/clojure/contrib/trace.clj
index 0e53b4b3..3be09ee6 100644
--- a/modules/trace/src/main/clojure/clojure/contrib/trace.clj
+++ b/modules/trace/src/main/clojure/clojure/contrib/trace.clj
@@ -39,6 +39,7 @@ code is doing."}
 
 (def
  ^{:doc "Current stack depth of traced function calls."}
+ ^:dynamic
  *trace-depth* 0)
 
 (defn tracer