diff --git a/debian/rules b/debian/rules
index 4f0fcd4..59cbb0f 100755
--- a/debian/rules
+++ b/debian/rules
@@ -63,3 +63,4 @@ install/sugar-physics-activity::
 	rm -f debian/sugar-physics-activity/usr/share/sugar/activities/Physics.activity/COPYING
 	rm -f debian/sugar-physics-activity/usr/share/sugar/activities/Physics.activity/olpcgames/copying
 	find debian/sugar-physics-activity/usr/share/sugar/activities/Physics.activity/ -type f -print0 | xargs -0 chmod a-x
+	ln -sf /usr/share/sugar/activities/Physics.activity/activity/mimetypes.xml debian/sugar-physics-activity/usr/share/mime/packages/org.laptop.physics.xml