diff --git a/src/next/jdbc/default_options.clj b/src/next/jdbc/default_options.clj
index 726aad5..89f9d82 100644
--- a/src/next/jdbc/default_options.clj
+++ b/src/next/jdbc/default_options.clj
@@ -1,9 +1,11 @@
-;; copyright (c) 2020 Sean Corfield, all rights reserved
+;; copyright (c) 2020-2021 Sean Corfield, all rights reserved
 
 (ns ^:no-doc next.jdbc.default-options
   "Implementation of default options logic."
   (:require [next.jdbc.protocols :as p]))
 
+(set! *warn-on-reflection* true)
+
 (defrecord DefaultOptions [connectable options])
 
 (extend-protocol p/Sourceable
diff --git a/src/next/jdbc/plan.clj b/src/next/jdbc/plan.clj
index d4c903a..152bed9 100644
--- a/src/next/jdbc/plan.clj
+++ b/src/next/jdbc/plan.clj
@@ -1,10 +1,12 @@
-;; copyright (c) 2020 Sean Corfield, all rights reserved
+;; copyright (c) 2020-2021 Sean Corfield, all rights reserved
 
 (ns next.jdbc.plan
   "Some helper functions that make common operations with `next.jdbc/plan`
   much easier."
   (:require [next.jdbc :as jdbc]))
 
+(set! *warn-on-reflection* true)
+
 (defn select-one!
   "Execute the SQL and params using `next.jdbc/plan` and return just the
   selected columns from just the first row.