diff --git a/apps/openmw/mwrender/occlusionquery.cpp b/apps/openmw/mwrender/occlusionquery.cpp
index 781b522b63..0c917cda19 100644
--- a/apps/openmw/mwrender/occlusionquery.cpp
+++ b/apps/openmw/mwrender/occlusionquery.cpp
@@ -6,6 +6,7 @@
 #include <OgreHardwareOcclusionQuery.h>
 #include <OgreEntity.h>
 #include <OgreSubEntity.h>
+#include <OgreMaterialManager.h>
 
 using namespace MWRender;
 using namespace Ogre;