diff --git a/CHANGES.md b/CHANGES.md
index 0a69098..8c19a31 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -3,7 +3,7 @@
 * `#sql/inline nil` should produce `NULL`. Fix #221. (@seancorfield)
 * `#sql/inline :kw` should produce `"kw"`. Fix #224 via PR #225. (@vincent-dm) Note: this introduces a new protocol, `Inlinable`, which controls inline value rendering, and changes the behavior of `#sql/inline :foo/bar` to produce just `"bar"` (where it was probably invalid SQL before).
 * Alias expressions `[:col :alias]` are now checked to have exactly two elements. Fix #226.
-* Allow `where` and `merge-where` to be given no predicates. Fix #228.
+* Allow `where` and `merge-where` to be given no predicates. Fix #228 and PR #230.
 
 ## 0.9.3
 
diff --git a/test/honeysql/core_test.cljc b/test/honeysql/core_test.cljc
index 2c3ceb6..f3b9cbf 100644
--- a/test/honeysql/core_test.cljc
+++ b/test/honeysql/core_test.cljc
@@ -6,7 +6,7 @@
             [honeysql.helpers :refer [select modifiers from join left-join
                                       right-join full-join where group having
                                       order-by limit offset values columns
-                                      insert-into with]]
+                                      insert-into with merge-where]]
             honeysql.format-test))
 
 ;; TODO: more tests
@@ -215,4 +215,20 @@
              (where [:= :id (sql/inline nil)])
              sql/format))))
 
+(deftest merge-where-no-params-test
+  (testing "merge-where called with just the map as parameter - see #228"
+    (let [sqlmap (-> (select :*)
+                     (from :table)
+                     (where [:= :foo :bar]))]
+      (is (= ["SELECT * FROM table WHERE foo = bar"]
+             (sql/format (apply merge-where sqlmap [])))))))
+
+(deftest merge-where-test
+  (is (= ["SELECT * FROM table WHERE (foo = bar AND quuz = xyzzy)"]
+         (-> (select :*)
+             (from :table)
+             (where [:= :foo :bar])
+             (merge-where [:= :quuz :xyzzy])
+             sql/format))))
+
 #?(:cljs (cljs.test/run-all-tests))