diff --git a/shared/src/main/scala/io/kaitai/struct/languages/JavaCompiler.scala b/shared/src/main/scala/io/kaitai/struct/languages/JavaCompiler.scala
index 503fa8b68..cb9dc4d5e 100644
--- a/shared/src/main/scala/io/kaitai/struct/languages/JavaCompiler.scala
+++ b/shared/src/main/scala/io/kaitai/struct/languages/JavaCompiler.scala
@@ -430,7 +430,7 @@ class JavaCompiler(typeProvider: ClassTypeProvider, config: RuntimeConfig)
   override def allocateIOFixed(varName: Identifier, size: String): String = {
     val ioName = idToStr(IoStorageIdentifier(varName))
 
-    out.puts(s"$kstreamName $ioName = new ByteBufferKaitaiStream($size);")
+    out.puts(s"final $kstreamName $ioName = new ByteBufferKaitaiStream($size);")
     ioName
   }