diff --git a/code/fgame/bg_public.h b/code/fgame/bg_public.h
index 149c6898..70edaa77 100644
--- a/code/fgame/bg_public.h
+++ b/code/fgame/bg_public.h
@@ -724,6 +724,7 @@ movement on the server game.
     (CONTENTS_LADDER | CONTENTS_CLAYPIDGEON | CONTENTS_BBOX | CONTENTS_NOBOTCLIP | CONTENTS_UNKNOWN3 | CONTENTS_BODY \
      | CONTENTS_CORPSE)
 #define MASK_MOVEINFO (CONTENTS_SOLID | CONTENTS_FENCE)
+#define MASK_AI_CANSEE   (CONTENTS_SOLID | CONTENTS_LAVA | CONTENTS_SLIME | CONTENTS_BBOX | CONTENTS_UNKNOWN2 | CONTENTS_FENCE | CONTENTS_WEAPONCLIP)
 
     // mohaa mask
     /*