diff --git a/spec/actions_spec.lua b/spec/actions_spec.lua
index c1a1f4c..8f365e1 100644
--- a/spec/actions_spec.lua
+++ b/spec/actions_spec.lua
@@ -3,8 +3,8 @@ getmetatable(Parser()).error = function(_, msg) error(msg) end
 
 describe("tests related to actions", function()
    it("calls actions for options", function()
-      local action1 = spy.new(function(x) end)
-      local action2 = spy.new(function(x) end)
+      local action1 = spy.new(function() end)
+      local action2 = spy.new(function() end)
 
       local parser = Parser()
       parser:option "-f" "--from" {
@@ -23,9 +23,9 @@ describe("tests related to actions", function()
    end)
 
    it("properly calls actions for flags", function()
-      local action1 = spy.new(function(x) end)
-      local action2 = spy.new(function(x) end)
-      local action3 = spy.new(function(x) end)
+      local action1 = spy.new(function() end)
+      local action2 = spy.new(function() end)
+      local action3 = spy.new(function() end)
 
       local parser = Parser()
       parser:flag "-v" "--verbose" {
@@ -47,7 +47,7 @@ describe("tests related to actions", function()
    end)
 
    it("calls actions for commands", function()
-      local action = spy.new(function(x) end)
+      local action = spy.new(function() end)
 
       local parser = Parser "name"
       parser:flag "-v" "--verbose" {
diff --git a/spec/commands_spec.lua b/spec/commands_spec.lua
index 5a0c7b0..2a56026 100644
--- a/spec/commands_spec.lua
+++ b/spec/commands_spec.lua
@@ -37,8 +37,8 @@ describe("tests related to commands", function()
    it("handles nested commands", function()
       local parser = Parser "name"
       local foo = parser:command "foo"
-      local bar = foo:command "bar"
-      local baz = foo:command "baz"
+      foo:command "bar"
+      foo:command "baz"
 
       local args = parser:parse{"foo", "bar"}
       assert.same({foo = true, bar = true}, args)
@@ -57,7 +57,7 @@ describe("tests related to commands", function()
 
    it("Detects wrong commands", function()
       local parser = Parser "name"
-      local install = parser:command "install"
+      parser:command "install"
 
       assert.has_error(function() parser:parse{"run"} end, "unknown command 'run'")
    end)
diff --git a/spec/default_spec.lua b/spec/default_spec.lua
index 55afe80..746d141 100644
--- a/spec/default_spec.lua
+++ b/spec/default_spec.lua
@@ -9,7 +9,7 @@ describe("tests related to default values", function()
             :default "bar"
          local args = parser:parse{}
          assert.same({foo = "bar"}, args)
-         local args = parser:parse{"baz"}
+         args = parser:parse{"baz"}
          assert.same({foo = "baz"}, args)
       end)
 
diff --git a/spec/options_spec.lua b/spec/options_spec.lua
index eaeeaab..76498e6 100644
--- a/spec/options_spec.lua
+++ b/spec/options_spec.lua
@@ -69,7 +69,7 @@ describe("tests related to options", function()
          parser:flag("-q", "--quiet")
          local args = parser:parse({"--quiet"})
          assert.same({quiet = true}, args)
-         local args = parser:parse({})
+         args = parser:parse({})
          assert.same({}, args)
       end)