diff --git a/src/main/clojure/clojure/tools/analyzer/jvm.clj b/src/main/clojure/clojure/tools/analyzer/jvm.clj
index 5559cdd..a63eb78 100644
--- a/src/main/clojure/clojure/tools/analyzer/jvm.clj
+++ b/src/main/clojure/clojure/tools/analyzer/jvm.clj
@@ -48,6 +48,8 @@
   (:import (clojure.lang IObj RT Compiler Var)
            java.net.URL))
 
+(set! *warn-on-reflection* true)
+
 (def ns-safe-macro
   "Clojure macros that are known to not alter namespaces"
   #{#'clojure.core/->
diff --git a/src/main/clojure/clojure/tools/analyzer/jvm/utils.clj b/src/main/clojure/clojure/tools/analyzer/jvm/utils.clj
index eabee1d..a159c4e 100644
--- a/src/main/clojure/clojure/tools/analyzer/jvm/utils.clj
+++ b/src/main/clojure/clojure/tools/analyzer/jvm/utils.clj
@@ -16,6 +16,8 @@
   (:import (clojure.lang RT Symbol Var)
            org.objectweb.asm.Type))
 
+(set! *warn-on-reflection* true)
+
 (defn ^:private type-reflect
   [typeref & options]
   (apply reflect/type-reflect typeref