diff --git a/server/block/break_info.go b/server/block/break_info.go
index dc1c5ab82..6126280f6 100644
--- a/server/block/break_info.go
+++ b/server/block/break_info.go
@@ -37,7 +37,7 @@ func BreakDuration(b world.Block, i item.Stack) time.Duration {
 	if info.Effective(t) {
 		eff := t.BaseMiningEfficiency(b)
 		if e, ok := i.Enchantment(enchantment.Efficiency{}); ok {
-			breakTime += (enchantment.Efficiency{}).Addend(e.Level())
+			eff += (enchantment.Efficiency{}).Addend(e.Level())
 		}
 		breakTime /= eff
 	}
diff --git a/server/block/ender_chest.go b/server/block/ender_chest.go
index ec171cc00..0add187a4 100644
--- a/server/block/ender_chest.go
+++ b/server/block/ender_chest.go
@@ -32,7 +32,7 @@ type EnderChest struct {
 
 // NewEnderChest creates a new initialised ender chest.
 func NewEnderChest() EnderChest {
-	return EnderChest{}
+	return EnderChest{viewers: &atomic.Int64{}}
 }
 
 // BreakInfo ...
diff --git a/server/item/bow.go b/server/item/bow.go
index 0826406c2..e756cbe14 100644
--- a/server/item/bow.go
+++ b/server/item/bow.go
@@ -72,7 +72,7 @@ func (Bow) Release(releaser Releaser, tx *world.Tx, ctx *UseContext, duration ti
 		if f, ok := enchant.Type().(interface{ BurnDuration() time.Duration }); ok {
 			burnDuration = f.BurnDuration()
 		}
-		if _, ok := enchant.Type().(interface{ PunchMultiplier(int, float64) float64 }); ok {
+		if _, ok := enchant.Type().(interface{ KnockBackMultiplier() float64 }); ok {
 			punchLevel = enchant.Level()
 		}
 		if p, ok := enchant.Type().(interface{ PowerDamage(int) float64 }); ok {