diff --git a/src/monattack.cpp b/src/monattack.cpp
index 646739419f4b4..46530885b7507 100644
--- a/src/monattack.cpp
+++ b/src/monattack.cpp
@@ -4834,8 +4834,9 @@ bool mattack::evolve_kill_strike( monster *z )
     const std::string target_name = target->disp_name();
     damage_instance damage( z->type->melee_damage );
     damage.mult_damage( 1.33f );
-    int damage_dealt = target->deal_damage( z, bp_torso, damage_instance( DT_STAB, rng( 10, 20 ),
-                                            rng( 5, 15 ) ) ).total_damage();
+    damage.add( damage_instance( DT_STAB, dice( z->type->melee_dice, z->type->melee_sides ), rng( 5,
+                                 15 ), 1.0, 0.5 ) );
+    int damage_dealt = target->deal_damage( z, bp_torso, damage ).total_damage();
     if( damage_dealt > 0 ) {
         auto msg_type = target == &g->u ? m_bad : m_warning;
         target->add_msg_player_or_npc( msg_type,