diff --git a/doc/fixes37.0 b/doc/fixes37.0
index 5a82bcabb..73fc8c66b 100644
--- a/doc/fixes37.0
+++ b/doc/fixes37.0
@@ -1,4 +1,4 @@
-$NHDT-Branch: NetHack-3.7 $:$NHDT-Revision: 1.141 $ $NHDT-Date: 1584869896 2020/03/22 09:38:16 $
+$NHDT-Branch: NetHack-3.7 $:$NHDT-Revision: 1.142 $ $NHDT-Date: 1584872363 2020/03/22 10:19:23 $
 
 General Fixes and Modified Features
 -----------------------------------
@@ -90,6 +90,7 @@ correctly account for fuel remaining when lit candles are attached
 praying on an unaligned altar outside of Gehennom behaved like an ordinary
 	prayer; make that always fail
 Discworld typo: Moving Pictures passage 12 "or" -> "of"
+unicorn corpses and wraith corpses could be sacrificed even if "too old"
 
 
 Fixes to 3.7.0-x Problems that Were Exposed Via git Repository
diff --git a/src/pray.c b/src/pray.c
index d69db0db4..7718bc247 100644
--- a/src/pray.c
+++ b/src/pray.c
@@ -1,4 +1,4 @@
-/* NetHack 3.6	pray.c	$NHDT-Date: 1584756090 2020/03/21 02:01:30 $  $NHDT-Branch: NetHack-3.7 $:$NHDT-Revision: 1.141 $ */
+/* NetHack 3.6	pray.c	$NHDT-Date: 1584872363 2020/03/22 10:19:23 $  $NHDT-Branch: NetHack-3.7 $:$NHDT-Revision: 1.142 $ */
 /* Copyright (c) Benson I. Margulies, Mike Stephenson, Steve Linhart, 1989. */
 /* NetHack may be freely redistributed.  See license for details. */
 
@@ -1371,6 +1371,8 @@ dosacrifice()
                 value = eaten_stat(value, otmp);
         }
 
+        /* same race or former pet results apply even if the corpse is
+           too old (value==0) */
         if (your_race(ptr)) {
             if (is_demon(g.youmonst.data)) {
                 You("find the idea very satisfying.");
@@ -1454,8 +1456,16 @@ dosacrifice()
             adjalign(-3);
             value = -1;
             HAggravate_monster |= FROMOUTSIDE;
+        } else if (!value) {
+            ; /* too old; don't give undead or unicorn bonus or penalty */
         } else if (is_undead(ptr)) { /* Not demons--no demon corpses */
-            if (u.ualign.type != A_CHAOTIC)
+            /* most undead that leave a corpse yield 'human' (or other race)
+               corpse so won't get here; the exception is wraith; give the
+               bonus for wraith to chaotics too because they are sacrificing
+               something valuable (unless hero refuses to eat such things) */
+            if (u.ualign.type != A_CHAOTIC
+                /* reaching this side of the 'or' means hero is chaotic */
+                || (ptr == &mons[PM_WRAITH] && u.uconduct.unvegetarian))
                 value += 1;
         } else if (is_unicorn(ptr)) {
             int unicalign = sgn(ptr->maligntyp);