diff --git a/doc/fixes3-7-0.txt b/doc/fixes3-7-0.txt
index 0787fcea3..3a183935f 100644
--- a/doc/fixes3-7-0.txt
+++ b/doc/fixes3-7-0.txt
@@ -1513,6 +1513,7 @@ Grimtooth is permanently poisoned, protects from poison, and can fling poison
 cursed magic whistle can teleport you to your pet
 Fire and Frost Brand can be invoked for expert level fireball or cone of cold
 wielding Trollsbane grants hungerless regeneration
+hitting with Ogresmasher gives a higher chance of knockback
 
 
 Fixes to 3.7.0-x General Problems Exposed Via git Repository
diff --git a/src/uhitm.c b/src/uhitm.c
index 6fe983a51..56a4079ce 100644
--- a/src/uhitm.c
+++ b/src/uhitm.c
@@ -5198,14 +5198,17 @@ mhitm_knockback(
     const char *knockedhow;
     coordxy dx, dy, defx, defy;
     int knockdistance = rn2(3) ? 1 : 2; /* 67%: 1 step, 33%: 2 steps */
+    int chance = 6; /* 1/6 chance of attack knocking back a monster */
     boolean u_agr = (magr == &gy.youmonst);
     boolean u_def = (mdef == &gy.youmonst);
     boolean was_u = FALSE, dismount = FALSE;
     struct obj *wep = weapon_used ? (u_agr ? uwep : MON_WEP(magr))
                                   : (struct obj *)0;
 
-    /* 1/6 chance of attack knocking back a monster */
-    if (rn2(6))
+    if (wep && is_art(wep, ART_OGRESMASHER))
+        chance = 2;
+
+    if (rn2(chance))
         return FALSE;
 
     /* decide where the first step will place the target; not accurate