diff --git a/CHANGELOG.md b/CHANGELOG.md
index a9d5374..a5903e2 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,8 @@
 # Changes
 
+* 2.2.next in progress
+  * Fix #380 by correcting test for function type in `register-clause!`.
+
 * 2.2.858 -- 2022-01-20
   * Address #377 by adding `honey.sql/map=` to convert a hash map into an equality condition (for a `WHERE` clause).
   * Address #351 by adding a `:cache` option to `honey.sql/format` (for Clojure only, not ClojureScript).
diff --git a/src/honey/sql.cljc b/src/honey/sql.cljc
index 8939f8f..a36e56b 100644
--- a/src/honey/sql.cljc
+++ b/src/honey/sql.cljc
@@ -1466,7 +1466,7 @@
           f (if (keyword? k)
               (get @clause-format k)
               formatter)]
-      (when-not (and f (fn? f))
+      (when-not (and f (or (fn? f) (and (var? f) (fn? (deref f)))) )
         (throw (ex-info "The formatter must be a function or existing clause"
                         {:type (type formatter)})))
       (swap! base-clause-order add-clause-before clause before)
@@ -1487,7 +1487,7 @@
           f (if (keyword? k)
               (get @special-syntax k)
               formatter)]
-      (when-not (and f (fn? f))
+      (when-not (and f (or (fn? f) (and (var? f) (fn? (deref f)))))
         (throw (ex-info "The formatter must be a function or existing fn name"
                         {:type (type formatter)})))
       (swap! special-syntax assoc function f))))
diff --git a/test/honey/sql_test.cljc b/test/honey/sql_test.cljc
index 652e8b1..0844ff1 100644
--- a/test/honey/sql_test.cljc
+++ b/test/honey/sql_test.cljc
@@ -722,7 +722,6 @@ ORDER BY id = ? DESC
           (is (:disallowed (ex-data e))))))))
     ;; should not produce: ["SELECT foo, bar FROM mytable ORDER BY foo; select * from users"]
 
-
 (deftest issue-319-test
   (testing "that registering a clause is idempotent"
     (is (= ["FOO"]
@@ -731,6 +730,10 @@ ORDER BY id = ? DESC
              (sut/register-clause! :foo (constantly ["FOO"]) nil)
              (format {:foo []}))))))
 
+(deftest issue-380-test
+  (testing "that registering a clause by name works"
+    (is (map? (sut/register-clause! :qualify :having :window)))))
+
 (deftest issue-321-linting
   (testing "empty IN is ignored by default"
     (is (= ["WHERE x IN ()"]