diff --git a/src/trap.c b/src/trap.c
index d6c2b62c6..09c5bcbb6 100644
--- a/src/trap.c
+++ b/src/trap.c
@@ -2408,7 +2408,7 @@ register struct monst *mtmp;
                 You("smell smoke.");
             if (is_ice(mtmp->mx, mtmp->my))
                 melt_ice(mtmp->mx, mtmp->my, (char *) 0);
-            if (see_it)
+            if (see_it && t_at(mtmp->mx, mtmp->my))
                 seetrap(trap);
             break;
         case PIT: