diff --git a/spec/arguments_spec.lua b/spec/arguments_spec.lua
index eca5f84..52acc47 100644
--- a/spec/arguments_spec.lua
+++ b/spec/arguments_spec.lua
@@ -3,7 +3,8 @@ local argparse = require "argparse"
 describe("tests related to positional arguments", function()
    local function curry(f, ...)
       local args = {...}
-      return function() return f(table.unpack(args)) end
+      local unpack = unpack or table.unpack
+      return function() return f(unpack(args)) end
    end
 
    describe("passing correct arguments", function()
diff --git a/spec/options_spec.lua b/spec/options_spec.lua
index 5bd56bd..b225131 100644
--- a/spec/options_spec.lua
+++ b/spec/options_spec.lua
@@ -3,7 +3,8 @@ local argparse = require "argparse"
 describe("tests related to options", function()
    local function curry(f, ...)
       local args = {...}
-      return function() return f(table.unpack(args)) end
+      local unpack = unpack or table.unpack
+      return function() return f(unpack(args)) end
    end
 
    describe("passing correct options", function()