diff --git a/apps/openmw/mwsound/libavwrapper.cpp b/apps/openmw/mwsound/libavwrapper.cpp
index 114b08105b..a12f412d12 100644
--- a/apps/openmw/mwsound/libavwrapper.cpp
+++ b/apps/openmw/mwsound/libavwrapper.cpp
@@ -1,6 +1,7 @@
 #ifndef HAVE_LIBSWRESAMPLE
 extern "C"
 {
+#define __STDC_CONSTANT_MACROS
 #include <stdint.h>
 
 #include <libavcodec/avcodec.h>