diff --git a/cmake/checks/ffmpeg_test.cpp b/cmake/checks/ffmpeg_test.cpp
index 7b49c38c7a85ccab210c3d7256d91a5bae64acea..81c755632f8fc36388fe5f24dd120afe294677fe 100644
--- a/cmake/checks/ffmpeg_test.cpp
+++ b/cmake/checks/ffmpeg_test.cpp
@@ -1,3 +1,5 @@
+#define __STDC_CONSTANT_MACROS
+
 #include <stdlib.h>
 
 extern "C" {