diff --git a/CHANGELOG.md b/CHANGELOG.md
index c5cc0a6..c49400e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,9 @@
 
 Only accretive/fixative changes will be made from now on.
 
+* 1.3.next in progress
+  * Fix [#287](https://github.com/seancorfield/next-jdbc/issues/287) by merging user-supplied options over `:return-keys true`.
+
 * 1.3.955 -- 2024-10-06
   * Address [#285](https://github.com/seancorfield/next-jdbc/issues/285) by setting the default Clojure version to the earliest supported (1.10.3) to give a better hint to users.
   * Update PostgreSQL **Tips & Tricks** example code to fix possible NPE. PR [#284](https://github.com/seancorfield/next-jdbc/pull/284) from [@ExNexu](https://github.com/ExNexu).
diff --git a/src/next/jdbc/result_set.clj b/src/next/jdbc/result_set.clj
index 5810507..5525a22 100644
--- a/src/next/jdbc/result_set.clj
+++ b/src/next/jdbc/result_set.clj
@@ -952,14 +952,14 @@
     (reify
       clojure.lang.IReduceInit
       (reduce [_ f init]
-        (reduce-stmt this f init (assoc opts :return-keys true)))
+        (reduce-stmt this f init (merge {:return-keys true} opts)))
       r/CollFold
       (coll-fold [_ n combinef reducef]
         (fold-stmt this n combinef reducef (.getConnection this)
-                   (assoc opts :return-keys true)))
+                   (merge {:return-keys true} opts)))
       (toString [_] "`IReduceInit` from `plan` -- missing reduction?")))
   (-execute-one [this _ opts]
-    (if-let [rs (stmt->result-set this (assoc opts :return-keys true))]
+    (if-let [rs (stmt->result-set this (merge {:return-keys true} opts))]
       (let [builder-fn (get opts :builder-fn as-maps)
             builder    (builder-fn rs opts)]
         (when (.next rs)
@@ -970,10 +970,10 @@
     (if (:multi-rs opts)
       (loop [go (.execute this) acc []]
         (if-let [rs (stmt->result-set-update-count
-                     (.getConnection this) this go (assoc opts :return-keys true))]
+                     (.getConnection this) this go (merge {:return-keys true} opts))]
           (recur (.getMoreResults this) (conj acc rs))
           acc))
-      (if-let [rs (stmt->result-set this (assoc opts :return-keys true))]
+      (if-let [rs (stmt->result-set this (merge {:return-keys true} opts))]
         (datafiable-result-set rs (.getConnection this) opts)
         [{:next.jdbc/update-count (.getUpdateCount this)}])))
 
@@ -1006,7 +1006,7 @@
     (if (:multi-rs opts)
       (loop [go (.execute this (first sql-params)) acc []]
         (if-let [rs (stmt->result-set-update-count
-                     (.getConnection this) this go (assoc opts :return-keys true))]
+                     (.getConnection this) this go (merge {:return-keys true} opts))]
           (recur (.getMoreResults this) (conj acc rs))
           acc))
       (if-let [rs (stmt-sql->result-set this (first sql-params))]