diff --git a/mods/ITEMS/mcl_enchanting/groupcaps.lua b/mods/ITEMS/mcl_enchanting/groupcaps.lua
index 0bc1b8e245..a445b73f21 100644
--- a/mods/ITEMS/mcl_enchanting/groupcaps.lua
+++ b/mods/ITEMS/mcl_enchanting/groupcaps.lua
@@ -61,7 +61,7 @@ function mcl_enchanting.update_groupcaps(itemstack)
 
 	if not hash or hash ~= groupcaps.hash then
 		local tool_capabilities = itemstack:get_tool_capabilities()
-		tool_capabilities.groupcaps = groupcaps.values
+		tool_capabilities.groupcaps = table.copy(groupcaps.values)
 
 		-- Increase the number of uses depending on the unbreaking level
 		-- of the tool.