diff --git a/src/babashka/impl/classes.clj b/src/babashka/impl/classes.clj
index 04499cf9..d63cf2da 100644
--- a/src/babashka/impl/classes.clj
+++ b/src/babashka/impl/classes.clj
@@ -32,6 +32,7 @@
           java.lang.Double
           java.lang.Exception
           java.lang.Integer
+          java.lang.Long
           java.lang.Math
           java.util.concurrent.LinkedBlockingQueue
           java.lang.Object