diff --git a/doc/fixes34.0 b/doc/fixes34.0
index a3f384e39..c341723af 100644
--- a/doc/fixes34.0
+++ b/doc/fixes34.0
@@ -443,6 +443,7 @@ allow fake player monsters to handle artifacts that don't match alignment/role
 chaotic monsters can use Stormbringer; lawful monsters can use Excalibur
 No "corridor disappears" message if Vault guard dies off-level
 slip while mounting and levitating at will should not cause damage
+if you see a monster jump into a trap in a secret corridor, it's not secret
 
 
 Platform- and/or Interface-Specific Fixes
diff --git a/src/muse.c b/src/muse.c
index a906cb19f..f1e7f0df8 100644
--- a/src/muse.c
+++ b/src/muse.c
@@ -717,6 +717,10 @@ mon_tele:
 			pline("%s %s into a %s!", Monnam(mtmp),
 			makeplural(locomotion(mtmp->data, "jump")),
 			t->ttyp == TRAPDOOR ? "trap door" : "hole");
+			if (levl[trapx][trapy].typ == SCORR) {
+			    levl[trapx][trapy].typ = CORR;
+			    unblock_point(trapx, trapy);
+			}
 			seetrap(t_at(trapx,trapy));
 		}
 
@@ -803,6 +807,10 @@ mon_tele:
 		if (vis) {
 			pline("%s %s onto a teleport trap!", Monnam(mtmp),
 				makeplural(locomotion(mtmp->data, "jump")));
+			if (levl[trapx][trapy].typ == SCORR) {
+			    levl[trapx][trapy].typ = CORR;
+			    unblock_point(trapx, trapy);
+			}
 			seetrap(t_at(trapx,trapy));
 		}
 		/*  don't use rloc_to() because worm tails must "move" */