diff --git a/doc/fixes37.0 b/doc/fixes37.0
index d9c52681e..6af69fff2 100644
--- a/doc/fixes37.0
+++ b/doc/fixes37.0
@@ -94,6 +94,7 @@ unicorn corpses and wraith corpses could be sacrificed even if "too old"
 hero polymorphed into a hider and hiding was not unhidden when teleporting
 impose tighter restraints on 'summon nasties', both for spellcasting monsters
 	and post-Wizard harassment
+prevent swallowing monster ending up in a solid wall if it killed vault guard
 
 
 Fixes to 3.7.0-x Problems that Were Exposed Via git Repository
diff --git a/src/mhitm.c b/src/mhitm.c
index 8083944bd..18655f46c 100644
--- a/src/mhitm.c
+++ b/src/mhitm.c
@@ -765,6 +765,8 @@ register struct attack *mattk;
          *  magr from level.monsters[mdef->mx][mdef->my].  We need to
          *  put it back and display it.  -kd
          */
+        if (!goodpos(dx, dy, magr, MM_IGNOREWATER))
+            dx = ax, dy = ay;
         place_monster(magr, dx, dy);
         newsym(dx, dy);
         /* aggressor moves to <dx,dy> and might encounter trouble there */