diff --git a/src/include/Makefile b/src/include/Makefile
index e9868f6d5..15c394189 100644
--- a/src/include/Makefile
+++ b/src/include/Makefile
@@ -29,7 +29,7 @@ HDRS	= actions.h ai.h ccl.h freecraft.h construct.h cursor.h font.h icons.h \
 	  image.h interface.h map.h minimap.h missile.h pathfinder.h player.h \
 	  pud.h tileset.h unit.h unittype.h upgrade.h upgrade_structs.h \
 	  ccl_sound.h sound.h sound_id.h unitsound.h wav.h sound_server.h \
-	  video.h network.h goal.h ui.h button.h menus.h \
+	  video.h network.h goal.h ui.h button.h menus.h spell.h \
 	  siod.h siodp.h iolib.h depend.h myendian.h rdtsc.h \
 	  etlib/generic.h etlib/xmalloc.h etlib/hash.h etlib/dllist.h