diff --git a/include/mondata.h b/include/mondata.h
index b3bdb27e4..7f62258a5 100644
--- a/include/mondata.h
+++ b/include/mondata.h
@@ -22,7 +22,7 @@
 #define is_lminion(mon) \
     (is_minion((mon)->data) && mon_aligntyp(mon) == A_LAWFUL)
 #define is_flyer(ptr) (((ptr)->mflags1 & M1_FLY) != 0L)
-#define is_floater(ptr) ((ptr)->mlet == S_EYE)
+#define is_floater(ptr) ((ptr)->mlet == S_EYE || (ptr)->mlet == S_LIGHT)
 #define is_clinger(ptr) (((ptr)->mflags1 & M1_CLING) != 0L)
 #define is_swimmer(ptr) (((ptr)->mflags1 & M1_SWIM) != 0L)
 #define breathless(ptr) (((ptr)->mflags1 & M1_BREATHLESS) != 0L)