diff --git a/apps/openmw/CMakeLists.txt b/apps/openmw/CMakeLists.txt
index 887eedebb..bf21805d0 100644
--- a/apps/openmw/CMakeLists.txt
+++ b/apps/openmw/CMakeLists.txt
@@ -113,7 +113,10 @@ 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
     ${OPENSCENEGRAPH_LIBRARIES}