diff --git a/sci b/sci
index c09cff72..a7cdb456 160000
--- a/sci
+++ b/sci
@@ -1 +1 @@
-Subproject commit c09cff7206effebc05714b4fe6f67793736e7445
+Subproject commit a7cdb456e8579d623fa8fb6a63faf476931cb11b
diff --git a/src/babashka/impl/classes.clj b/src/babashka/impl/classes.clj
index 98d59b72..3f031a43 100644
--- a/src/babashka/impl/classes.clj
+++ b/src/babashka/impl/classes.clj
@@ -107,6 +107,8 @@
           java.io.FileReader
           java.io.InputStreamReader
           java.io.OutputStreamWriter
+          java.io.PipedInputStream
+          java.io.PipedOutputStream
           java.io.PrintStream
           java.io.PrintWriter
           java.io.PushbackInputStream
diff --git a/test/babashka/main_test.clj b/test/babashka/main_test.clj
index a703b1ee..5e1059f6 100644
--- a/test/babashka/main_test.clj
+++ b/test/babashka/main_test.clj
@@ -741,7 +741,16 @@ true")))
             (test-utils/normalize (test-utils/bb "{:a #abc 123}{:a #cde 789}" "--stream" "-e" "(println (:a *input*))")))))
     (testing "when reading one EDN form from stdin (no --stream or -I or -i)"
       (is (= "#abc 123\n"
-            (test-utils/normalize (test-utils/bb "{:a #abc 123}{:a #cde 789}" "-e" "(println (:a *input*))")))))))
+             (test-utils/normalize (test-utils/bb "{:a #abc 123}{:a #cde 789}" "-e" "(println (:a *input*))")))))))
+
+(deftest piped-input-output-stream-test
+  (is (= 10 (bb nil "
+(def po (java.io.PipedOutputStream.))
+(def pi (java.io.PipedInputStream.))
+(.connect pi po)
+(.write po 10)
+(.read pi)
+"))))
 
 ;;;; Scratch