diff --git a/CHANGELOG.md b/CHANGELOG.md
index ac0a0eae..3961c234 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -11,6 +11,7 @@ A preview of the next release can be installed from
 - feat: Honor `*print-namespace-maps*` in pprint ([@ghoseb](https://github.com/ghoseb))
 - [#1369](https://github.com/babashka/babashka/issues/1369): provide `.sha256` files for every released asset
 - [#1397](https://github.com/babashka/babashka/issues/1397): Add `clojure.lang.Namespace` as alias for `sci.lang.Namespace`, such that `(instance? clojure.lang.Namespace *ns*)` returns `true` in bb
+- [#1384](https://github.com/babashka/babashka/issues/1384): allow `.indexOf` on `LazySeq`
 
 ## 0.10.163 (2022-09-24)
 
diff --git a/src/babashka/impl/classes.clj b/src/babashka/impl/classes.clj
index f245e635..f9340772 100644
--- a/src/babashka/impl/classes.clj
+++ b/src/babashka/impl/classes.clj
@@ -119,6 +119,8 @@
     {:fields [{:name "EMPTY"}]}
     clojure.lang.APersistentVector
     {:methods [{:name "indexOf"}]}
+    clojure.lang.LazySeq
+    {:methods [{:name "indexOf"}]}
     clojure.lang.ILookup
     {:methods [{:name "valAt"}]}
     clojure.lang.IPersistentMap
@@ -517,7 +519,6 @@
                       clojure.lang.IPersistentVector
                       clojure.lang.ITransientVector
                       clojure.lang.Iterate
-                      clojure.lang.LazySeq
                       clojure.lang.LispReader$Resolver
                       clojure.lang.Named
                       clojure.lang.Keyword
diff --git a/test/babashka/main_test.clj b/test/babashka/main_test.clj
index b3914c3e..28102ba8 100644
--- a/test/babashka/main_test.clj
+++ b/test/babashka/main_test.clj
@@ -840,6 +840,9 @@ true")))
 (deftest clojure-ns-test
   (is (true? (bb nil "(instance? clojure.lang.Namespace *ns*)"))))
 
+(deftest index-of-test
+  (is (= 1 (bb nil "(.indexOf (map inc [1 2 3]) 3)"))))
+
 ;;;; Scratch
 
 (comment