diff --git a/core/src/avm2/globals/flash/utils/ByteArray.as b/core/src/avm2/globals/flash/utils/ByteArray.as
index 08bf8b1b7122..8bbd262a1b1b 100644
--- a/core/src/avm2/globals/flash/utils/ByteArray.as
+++ b/core/src/avm2/globals/flash/utils/ByteArray.as
@@ -1,6 +1,6 @@
 package flash.utils {
 	[Ruffle(InstanceAllocator)]
-	public class ByteArray implements IDataInput, IDataOutput {
+	public class ByteArray implements IDataInput2, IDataOutput2 {
 		private static var _defaultObjectEncoding:uint = 3;
 		public static function get defaultObjectEncoding():uint {
 			return _defaultObjectEncoding;
diff --git a/core/src/avm2/globals/flash/utils/IDataInput2.as b/core/src/avm2/globals/flash/utils/IDataInput2.as
new file mode 100644
index 000000000000..9242eaec6544
--- /dev/null
+++ b/core/src/avm2/globals/flash/utils/IDataInput2.as
@@ -0,0 +1,4 @@
+package flash.utils {
+    internal interface IDataInput2 extends IDataInput {
+    }
+}
\ No newline at end of file
diff --git a/core/src/avm2/globals/flash/utils/IDataOutput2.as b/core/src/avm2/globals/flash/utils/IDataOutput2.as
new file mode 100644
index 000000000000..8356850320e4
--- /dev/null
+++ b/core/src/avm2/globals/flash/utils/IDataOutput2.as
@@ -0,0 +1,4 @@
+package flash.utils {
+    internal interface IDataOutput2 extends IDataOutput {
+    }
+}
\ No newline at end of file
diff --git a/core/src/avm2/globals/globals.as b/core/src/avm2/globals/globals.as
index cd98ee3abd31..a35dd7fecf5d 100644
--- a/core/src/avm2/globals/globals.as
+++ b/core/src/avm2/globals/globals.as
@@ -36,6 +36,8 @@ include "flash/crypto.as"
 
 include "flash/utils/IDataInput.as"
 include "flash/utils/IDataOutput.as"
+include "flash/utils/IDataInput2.as"
+include "flash/utils/IDataOutput2.as"
 include "flash/utils/IExternalizable.as"
 include "flash/utils/ByteArray.as"
 include "flash/utils/Dictionary.as"