diff --git a/doc/fixes3-7-0.txt b/doc/fixes3-7-0.txt
index e1c8eccf3..f2a0fd164 100644
--- a/doc/fixes3-7-0.txt
+++ b/doc/fixes3-7-0.txt
@@ -1,4 +1,4 @@
-HDT-Branch: NetHack-3.7 $:$NHDT-Revision: 1.1181 $ $NHDT-Date: 1684621591 2023/05/20 22:26:31 $
+HDT-Branch: NetHack-3.7 $:$NHDT-Revision: 1.1188 $ $NHDT-Date: 1685202441 2023/05/27 15:47:21 $
 
 General Fixes and Modified Features
 -----------------------------------
@@ -1595,6 +1595,9 @@ quest nemesis and a few other special monsters are suppressed from bones;
 running the tutorial until completion and returning to normal play but left
 	the 'no followers' flag set; adjacent pets wouldn't tag along when
 	hero moved to other levels
+when a magic whistle moved a hidden pet it brought that out of hiding and
+	gave a message about "your <pet> appears" but the map was updated
+	while it was still hidden so nothing seemed to appear
 
 
 Fixes to 3.7.0-x Platform and/or Interface Problems Exposed Via git Repository
diff --git a/src/apply.c b/src/apply.c
index 1b7a64659..1dead6b0e 100644
--- a/src/apply.c
+++ b/src/apply.c
@@ -1,4 +1,4 @@
-/* NetHack 3.7	apply.c	$NHDT-Date: 1655631557 2022/06/19 09:39:17 $  $NHDT-Branch: NetHack-3.7 $:$NHDT-Revision: 1.381 $ */
+/* NetHack 3.7	apply.c	$NHDT-Date: 1685202442 2023/05/27 15:47:22 $  $NHDT-Branch: NetHack-3.7 $:$NHDT-Revision: 1.420 $ */
 /* Copyright (c) Stichting Mathematisch Centrum, Amsterdam, 1985. */
 /*-Copyright (c) Robert Patrick Rankin, 2012. */
 /* NetHack may be freely redistributed.  See license for details. */
@@ -540,7 +540,10 @@ magic_whistled(struct obj *obj)
         mnexto(mtmp, !already_discovered ? RLOC_MSG : RLOC_NONE);
 
         if (mtmp->mx != omx || mtmp->my != omy) {
-            mtmp->mundetected = 0; /* reveal non-mimic hider iff it moved */
+            if (mtmp->mundetected) { /* reveal non-mimic hider that moved */
+                mtmp->mundetected = 0;
+                newsym(mtmp->mx, mtmp->my);
+            }
             /*
              * FIXME:
              *  All relocated monsters should change positions essentially