diff --git a/reflection.json b/reflection.json
index 507ad76c..ee23dd4c 100644
--- a/reflection.json
+++ b/reflection.json
@@ -263,6 +263,21 @@
   "allPublicMethods" : true,
   "allPublicFields" : true,
   "allPublicConstructors" : true
+}, {
+  "name" : "java.util.Base64",
+  "allPublicMethods" : true,
+  "allPublicFields" : true,
+  "allPublicConstructors" : true
+}, {
+  "name" : "java.util.Base64$Decoder",
+  "allPublicMethods" : true,
+  "allPublicFields" : true,
+  "allPublicConstructors" : true
+}, {
+  "name" : "java.util.Base64$Encoder",
+  "allPublicMethods" : true,
+  "allPublicFields" : true,
+  "allPublicConstructors" : true
 }, {
   "name" : "java.util.concurrent.LinkedBlockingQueue",
   "allPublicMethods" : true,
diff --git a/src/babashka/impl/classes.clj b/src/babashka/impl/classes.clj
index be6cbec9..36965fc3 100644
--- a/src/babashka/impl/classes.clj
+++ b/src/babashka/impl/classes.clj
@@ -59,6 +59,9 @@
                       java.time.ZoneOffset
                       java.time.temporal.TemporalAccessor
                       java.util.regex.Pattern
+                      java.util.Base64
+                      java.util.Base64$Decoder
+                      java.util.Base64$Encoder
                       sun.nio.fs.UnixPath ;; included because of permission check
                       ]
    :custom-classes {'java.lang.Thread
diff --git a/test/babashka/main_test.clj b/test/babashka/main_test.clj
index 056246a0..81affbd8 100644
--- a/test/babashka/main_test.clj
+++ b/test/babashka/main_test.clj
@@ -297,6 +297,10 @@
 (deftest Math-test
   (is (== 8.0 (bb nil "(Math/pow 2 3)"))))
 
+(deftest Base64-test
+  (is (= "babashka"
+         (bb nil "(String. (.decode (java.util.Base64/getDecoder) (.encode (java.util.Base64/getEncoder) (.getBytes \"babashka\"))))"))))
+
 ;;;; Scratch
 
 (comment