diff --git a/backend/src/app/util/bytes.clj b/backend/src/app/util/bytes.clj
index 1a36151abd..50a73d3350 100644
--- a/backend/src/app/util/bytes.clj
+++ b/backend/src/app/util/bytes.clj
@@ -36,6 +36,10 @@
   [s]
   (instance? OutputStream s))
 
+(defn data-input-stream?
+  [s]
+  (instance? DataInputStream s))
+
 (defn data-output-stream?
   [s]
   (instance? DataOutputStream s))