diff --git a/apps/openmw/CMakeLists.txt b/apps/openmw/CMakeLists.txt
index d541521006..53c9daf768 100644
--- a/apps/openmw/CMakeLists.txt
+++ b/apps/openmw/CMakeLists.txt
@@ -108,7 +108,10 @@ endif ()
 
 # Sound stuff - here so CMake doesn't stupidly recompile EVERYTHING
 # when we change the backend.
-include_directories(${SOUND_INPUT_INCLUDES})
+include_directories(
+    ${SOUND_INPUT_INCLUDES}
+    ${FFMPEG_INCLUDE_DIRS}
+)
 
 target_link_libraries(openmw
     ${OENGINE_LIBRARY}