diff --git a/apps/openmw/mwrender/skyutil.cpp b/apps/openmw/mwrender/skyutil.cpp
index e37a3d1033..95ca1fcf6c 100644
--- a/apps/openmw/mwrender/skyutil.cpp
+++ b/apps/openmw/mwrender/skyutil.cpp
@@ -154,6 +154,8 @@ namespace MWRender
         return visibleRatio;
     }
 
+    OcclusionCallback::~OcclusionCallback() {}
+
     float OcclusionCallback::updateVisibleRatio(osg::Camera* camera)
     {
         int visible = mOcclusionQueryVisiblePixels->getQueryGeometry()->getNumPixels(camera);
diff --git a/apps/openmw/mwrender/skyutil.hpp b/apps/openmw/mwrender/skyutil.hpp
index 71e9a02f41..5fabdd8cd0 100644
--- a/apps/openmw/mwrender/skyutil.hpp
+++ b/apps/openmw/mwrender/skyutil.hpp
@@ -114,6 +114,7 @@ namespace MWRender
         OcclusionCallback(
             osg::ref_ptr<osg::OcclusionQueryNode> oqnVisible, osg::ref_ptr<osg::OcclusionQueryNode> oqnTotal);
         float getVisibleRatio(osg::Camera* camera, bool smooth);
+        virtual ~OcclusionCallback();
 
     protected:
         virtual float updateVisibleRatio(osg::Camera* camera);