--- a/net/minecraft/world/item/MaceItem.java
+++ b/net/minecraft/world/item/MaceItem.java
@@ -23,6 +23,10 @@
 import net.minecraft.world.level.World;
 import net.minecraft.world.phys.Vec3D;
 
+// CraftBukkit start
+import org.bukkit.craftbukkit.util.CraftVector;
+// CraftBukkit end
+
 public class MaceItem extends Item {
 
     private static final int DEFAULT_ATTACK_DAMAGE = 5;
@@ -133,7 +137,15 @@
             Vec3D vec3d1 = vec3d.normalize().scale(d0);
 
             if (d0 > 0.0D) {
-                entityliving.push(vec3d1.x, (double) 0.7F, vec3d1.z);
+                // entityliving.push(vec3d1.x, 0.7F, vec3d1.z); // CraftBukkit - moved below
+                // CraftBukkit start - EntityKnockbackEvent
+                Vec3D vec3dPush = new Vec3D(vec3d1.x, 0.7F, vec3d1.z);
+                Vec3D result = entity.getDeltaMovement().add(vec3dPush);
+                org.bukkit.event.entity.EntityKnockbackEvent event = org.bukkit.craftbukkit.event.CraftEventFactory.callEntityKnockbackEvent((org.bukkit.craftbukkit.entity.CraftLivingEntity) entityliving.getBukkitEntity(), entity, org.bukkit.event.entity.EntityKnockbackEvent.KnockbackCause.ENTITY_ATTACK, d0, result, vec3dPush.x, vec3dPush.y, vec3dPush.z);
+                if (!event.isCancelled()) {
+                    entityliving.push(CraftVector.toNMS(event.getFinalKnockback()));
+                }
+                // CraftBukkit end
                 if (entityliving instanceof EntityPlayer) {
                     EntityPlayer entityplayer = (EntityPlayer) entityliving;