diff --git a/CMakeLists.txt b/CMakeLists.txt
index 58a092e..ed4a6d2 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -107,6 +107,7 @@ find_package(EBML CONFIG REQUIRED)
 find_package(JPEG REQUIRED)
 find_library(JPEG_TURBO turbojpeg REQUIRED)
 find_package(Matroska CONFIG REQUIRED)
+add_definitions(-DMATROSKA_VERSION=2)
 find_package(libsoundio CONFIG REQUIRED)
 find_library(LibUSB libusb-1.0 REQUIRED)
 find_package(libyuv CONFIG REQUIRED)