diff --git a/mods/ITEMS/mcl_enchanting/enchantments.lua b/mods/ITEMS/mcl_enchanting/enchantments.lua
index e876baf317..564d4b0d86 100644
--- a/mods/ITEMS/mcl_enchanting/enchantments.lua
+++ b/mods/ITEMS/mcl_enchanting/enchantments.lua
@@ -97,8 +97,9 @@ mcl_enchanting.enchantments.efficiency = {
 	weight = 10,
 	description = S("Increases mining speed."),
 	curse = false,
-	on_enchant = function(itemstack, level)
-		mcl_enchanting.update_groupcaps(itemstack)
+	on_enchant = function()
+		-- Updating digging speed is handled by update_groupcaps which
+		-- is called from load_enchantments.
 	end,
 	requires_tool = false,
 	treasure = false,
@@ -671,8 +672,8 @@ mcl_enchanting.enchantments.unbreaking = {
 		tool_capabilities.punch_attack_uses = tool_capabilities.punch_attack_uses * (1 + level)
 		itemstack:get_meta():set_tool_capabilities(tool_capabilities)
 
-		-- Unbreaking for groupcaps is handled in this function.
-		mcl_enchanting.update_groupcaps(itemstack)
+		-- Updating digging durability is handled by update_groupcaps
+		-- which is called from load_enchantments.
 	end,
 	requires_tool = true,
 	treasure = false,
diff --git a/mods/ITEMS/mcl_enchanting/engine.lua b/mods/ITEMS/mcl_enchanting/engine.lua
index 97a176b971..e47cf06507 100644
--- a/mods/ITEMS/mcl_enchanting/engine.lua
+++ b/mods/ITEMS/mcl_enchanting/engine.lua
@@ -14,10 +14,11 @@ end
 
 function mcl_enchanting.unload_enchantments(itemstack)
 	local itemdef = itemstack:get_definition()
-	if itemdef.tool_capabilities then
-		itemstack:get_meta():set_tool_capabilities(nil)
-	end
 	local meta = itemstack:get_meta()
+	if itemdef.tool_capabilities then
+		meta:set_tool_capabilities(nil)
+		meta:set_string("groupcaps_hash", "")
+	end
 	if meta:get_string("name") == "" then
 		meta:set_string("description", "")
 		meta:set_string("groupcaps_hash", "")
@@ -33,6 +34,7 @@ function mcl_enchanting.load_enchantments(itemstack, enchantments)
 				enchantment_def.on_enchant(itemstack, level)
 			end
 		end
+		mcl_enchanting.update_groupcaps(itemstack)
 	end
 	tt.reload_itemstack_description(itemstack)
 end
diff --git a/mods/ITEMS/mcl_enchanting/groupcaps.lua b/mods/ITEMS/mcl_enchanting/groupcaps.lua
index a445b73f21..ec8d11d21e 100644
--- a/mods/ITEMS/mcl_enchanting/groupcaps.lua
+++ b/mods/ITEMS/mcl_enchanting/groupcaps.lua
@@ -2,10 +2,7 @@ local groupcaps_cache = {}
 
 -- Compute a hash value.
 function compute_hash(value)
-	-- minetest.get_password_hash is quite fast, even if it uses a
-	-- cryptographic hashing function (SHA-1).  It is written in C++ and it
-	-- is probably hard to write a faster hashing function in Lua.
-	return string.sub(minetest.get_password_hash("ryvnf", minetest.serialize(value)), 1, 8)
+	return string.sub(minetest.sha1(minetest.serialize(value)), 1, 8)
 end
 
 -- Get the groupcaps and hash for an enchanted tool.  If this function is called