diff --git a/include/trap.h b/include/trap.h
index 0d786b550..a0592f7e1 100644
--- a/include/trap.h
+++ b/include/trap.h
@@ -123,6 +123,6 @@ enum trap_immunities {
 /* "transportation" traps */
 #define is_xport(ttyp) ((ttyp) >= TELEP_TRAP && (ttyp) <= MAGIC_PORTAL)
 #define fixed_tele_trap(t) ((t)->ttyp == TELEP_TRAP \
-                            && isok((t)->teledest.x,(t)->teledest.x))
+                            && isok((t)->teledest.x,(t)->teledest.y))
 
 #endif /* TRAP_H */