diff --git a/src/babashka/impl/classes.clj b/src/babashka/impl/classes.clj
index f0e69096..4f4e35b8 100644
--- a/src/babashka/impl/classes.clj
+++ b/src/babashka/impl/classes.clj
@@ -338,6 +338,7 @@
           java.util.Random
           java.util.regex.Matcher
           java.util.regex.Pattern
+          java.util.BitSet
           java.util.ArrayDeque
           java.util.ArrayList
           java.util.Collections