diff --git a/CHANGELOG.md b/CHANGELOG.md
index 38b3350..5d55dd3 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,7 +2,6 @@
 
 * 2.0.next in progress
   * The documentation continues to be expanded and clarified in response to feedback!
-  * Tentative fix for #315 by expanding `:in` handling to deal with `nil` values.
   * Fix #310 by adding support for `FILTER`, `WITHIN GROUP`, and `ORDER BY` (as an expression), from [nilenso/honeysql-postgres](https://github.com/nilenso/honeysql-postgres) 0.4.112. These are [Special Syntax](doc/special-syntax.md) and there are also helpers for `filter` and `within-group` -- so **be careful about referring in all of `honey.sql.helpers`** since it will now shadow `clojure.core/filter` (it already shadows `for`, `group-by`, `into`, `partition-by`, `set`, and `update`).
   * Fix #308 by supporting join clauses in `join-by` (and correcting the helper docstring).
 
diff --git a/src/honey/sql.cljc b/src/honey/sql.cljc
index 148db70..337d02c 100644
--- a/src/honey/sql.cljc
+++ b/src/honey/sql.cljc
@@ -927,34 +927,17 @@
     x))
 
 (defn- format-in [in [x y]]
-  (let [nil-check          (and (sequential? y) (not (ident? (first y))))
-        y'                 (if nil-check (remove nil? y) y)
-        [sql-x & params-x] (format-expr x {:nested true})
-        [sql-y & params-y] (format-expr y' {:nested true})
+  (let [[sql-x & params-x] (format-expr x {:nested true})
+        [sql-y & params-y] (format-expr y {:nested true})
         values             (unwrap (first params-y) {})]
     (if (and (= "?" sql-y) (= 1 (count params-y)) (coll? values))
-      (let [values' (remove nil? values)
-            sql     (str "(" (str/join ", " (repeat (count values') "?")) ")")
-            in      (str sql-x " " (sql-kw in) " " sql)]
-        (-> [(if (not= (count values) (count values'))
-               (if (zero? (count values'))
-                 (str sql-x " IS NULL")
-                 (str "(" in " OR " sql-x " IS NULL)"))
-               (if (zero? (count values))
-                 "FALSE"
-                 in))]
+      (let [sql (str "(" (str/join ", " (repeat (count values) "?")) ")")]
+        (-> [(str sql-x " " (sql-kw in) " " sql)]
             (into params-x)
-            (into values')))
-      (let [in (str sql-x " " (sql-kw in) " " sql-y)]
-        (-> [(if (and nil-check (not= (count y) (count y')))
-               (if (zero? (count y'))
-                 (str sql-x " IS NULL")
-                 (str "(" in " OR " sql-x " IS NULL)"))
-               (if (zero? (count y))
-                 "FALSE"
-                 in))]
-            (into params-x)
-            (into params-y))))))
+            (into values)))
+      (-> [(str sql-x " " (sql-kw in) " " sql-y)]
+          (into params-x)
+          (into params-y)))))
 
 (defn- function-0 [k xs]
   [(str (sql-kw k)
diff --git a/test/honey/sql/helpers_test.cljc b/test/honey/sql/helpers_test.cljc
index c92591e..14d1ce3 100644
--- a/test/honey/sql/helpers_test.cljc
+++ b/test/honey/sql/helpers_test.cljc
@@ -290,39 +290,6 @@
                               :from [:customers]
                               :where [:in :id values]})))
           (is (= ["SELECT * FROM customers WHERE id IN (?)" 1]
-                 (sql/format {:select [:*]
-                              :from [:customers]
-                              :where [:in :id :?ids]}
-                             {:params {:ids values}})))))
-      (testing (str "with just a nil value from a " (name cname))
-        (let [values (conj coll nil)]
-          (is (= ["SELECT * FROM customers WHERE id IS NULL"]
-                 (sql/format {:select [:*]
-                              :from [:customers]
-                              :where [:in :id values]})))
-          (is (= ["SELECT * FROM customers WHERE id IS NULL"]
-                 (sql/format {:select [:*]
-                              :from [:customers]
-                              :where [:in :id :?ids]}
-                             {:params {:ids values}})))))
-      (testing (str "with nil values from a " (name cname))
-        (let [values (conj coll 1 nil)]
-          (is (= ["SELECT * FROM customers WHERE (id IN (?) OR id IS NULL)" 1]
-                 (sql/format {:select [:*]
-                              :from [:customers]
-                              :where [:in :id values]})))
-          (is (= ["SELECT * FROM customers WHERE (id IN (?) OR id IS NULL)" 1]
-                 (sql/format {:select [:*]
-                              :from [:customers]
-                              :where [:in :id :?ids]}
-                             {:params {:ids values}})))))
-      (testing (str "with no values from a " (name cname))
-        (let [values coll]
-          (is (= ["SELECT * FROM customers WHERE FALSE"]
-                 (sql/format {:select [:*]
-                              :from [:customers]
-                              :where [:in :id values]})))
-          (is (= ["SELECT * FROM customers WHERE FALSE"]
                  (sql/format {:select [:*]
                               :from [:customers]
                               :where [:in :id :?ids]}
@@ -334,16 +301,6 @@
                             :from [:customers]
                             :where [:in :id values]})))
         (is (= ["SELECT * FROM customers WHERE id IN (?, ?)" 1 2]
-               (sql/format {:select [:*]
-                            :from [:customers]
-                            :where [:in :id :?ids]}
-                           {:params {:ids values}}))))
-      (let [values [1 nil 2]]
-        (is (= ["SELECT * FROM customers WHERE (id IN (?, ?) OR id IS NULL)" 1 2]
-               (sql/format {:select [:*]
-                            :from [:customers]
-                            :where [:in :id values]})))
-        (is (= ["SELECT * FROM customers WHERE (id IN (?, ?) OR id IS NULL)" 1 2]
                (sql/format {:select [:*]
                             :from [:customers]
                             :where [:in :id :?ids]}