diff --git a/spec/awful/util_spec.lua b/spec/awful/util_spec.lua
index 5e39f181..07bb1da1 100644
--- a/spec/awful/util_spec.lua
+++ b/spec/awful/util_spec.lua
@@ -4,7 +4,6 @@
 ---------------------------------------------------------------------------
 
 local util = require("awful.util")
-local say = require("say")
 
 describe("awful.util", function()
     it("table.keys_filter", function()
diff --git a/spec/gears/color_spec.lua b/spec/gears/color_spec.lua
index e7694e34..47b157ca 100644
--- a/spec/gears/color_spec.lua
+++ b/spec/gears/color_spec.lua
@@ -162,7 +162,7 @@ describe("gears.color", function()
 
     describe("create_opaque_pattern", function()
         -- Assertion to check if a pattern is opaque
-        local function opaque(state, arguments)
+        local function opaque(_, arguments)
             assert(arguments.n >= 1, say("assertions.argtolittle", { "opaque", 1, tostring(arguments.n) }))
             local pattern = color.create_opaque_pattern(arguments[1])
             return pattern ~= nil
diff --git a/spec/gears/object_spec.lua b/spec/gears/object_spec.lua
index e63463dc..2f41f0d1 100644
--- a/spec/gears/object_spec.lua
+++ b/spec/gears/object_spec.lua
@@ -54,7 +54,7 @@ describe("gears.object", function()
         obj:weak_connect_signal("signal", cb)
 
         -- Check that the GC doesn't disconnect the signal
-        for i = 1, 10 do
+        for _ = 1, 10 do
             collectgarbage("collect")
         end
 
@@ -149,7 +149,8 @@ describe("gears.object", function()
                 finalized = true
             end
             if _VERSION <= "Lua 5.1" then
-                local userdata = newproxy(true)
+                -- luacheck: globals newproxy
+                userdata = newproxy(true)
                 getmetatable(userdata).__gc = gc
                 getmetatable(userdata).callback = callback
             else
diff --git a/spec/menubar/icon_theme_spec.lua b/spec/menubar/icon_theme_spec.lua
index f02fd3a8..8588d3a2 100644
--- a/spec/menubar/icon_theme_spec.lua
+++ b/spec/menubar/icon_theme_spec.lua
@@ -6,24 +6,24 @@
 -- Hack so that beautiful can be loaded
 _G.awesome = {
     xrdb_get_value = function() end,
-    connect_signal = function(...) end,
-    register_xproperty = function(...) end
+    connect_signal = function() end,
+    register_xproperty = function() end
 }
 -- Additional hacks to load menubar
 _G.screen = {
-    add_signal = function(...) end,
+    add_signal = function() end,
     count = function() return 0 end
 }
 _G.client = {
-    connect_signal = function(...) end,
-    add_signal = function(...) end
+    connect_signal = function() end,
+    add_signal = function() end
 }
 _G.tag = {
-    connect_signal = function(...) end,
-    add_signal = function(...) end
+    connect_signal = function() end,
+    add_signal = function() end
 }
 _G.root = {
-    cursor = function(...) end
+    cursor = function() end
 }
 
 local os = os
diff --git a/spec/wibox/hierarchy_spec.lua b/spec/wibox/hierarchy_spec.lua
index 55d7dc94..92541bc0 100644
--- a/spec/wibox/hierarchy_spec.lua
+++ b/spec/wibox/hierarchy_spec.lua
@@ -7,7 +7,6 @@ local hierarchy = require("wibox.hierarchy")
 
 local Region = require("lgi").cairo.Region
 local matrix = require("gears.matrix")
-local object = require("gears.object")
 local utils = require("wibox.test_utils")
 
 local function make_widget(children)
@@ -18,8 +17,8 @@ local function make_widget(children)
     return result
 end
 
-local function make_child(widget, width, height, matrix)
-    return { _widget = widget, _width = width, _height = height, _matrix = matrix }
+local function make_child(widget, width, height, mat)
+    return { _widget = widget, _width = width, _height = height, _matrix = mat }
 end
 
 describe("wibox.hierarchy", function()
@@ -95,7 +94,7 @@ describe("wibox.hierarchy", function()
             end
         end
         local context = {}
-        local instance = hierarchy.new(context, parent, 15, 20, redraw, layout, extra_arg)
+        local instance = hierarchy.new(context, parent, 15, 20, redraw, layout, extra_arg) -- luacheck: no unused
 
         -- There should be a connection
         parent:emit_signal("widget::redraw_needed")
@@ -140,7 +139,7 @@ describe("wibox.hierarchy", function()
             assert.is.equal(#children, 1)
             hierarchy_intermediate = children[1]
 
-            local children = hierarchy_intermediate:get_children()
+            children = hierarchy_intermediate:get_children()
             assert.is.equal(#children, 1)
             hierarchy_child = children[1]
         end)
diff --git a/spec/wibox/test_utils.lua b/spec/wibox/test_utils.lua
index 08d2b01b..a557df76 100644
--- a/spec/wibox/test_utils.lua
+++ b/spec/wibox/test_utils.lua
@@ -4,7 +4,6 @@
 ---------------------------------------------------------------------------
 
 local object = require("gears.object")
-local cache = require("gears.cache")
 local matrix_equals = require("gears.matrix").equals
 local base = require("wibox.widget.base")
 local say = require("say")
@@ -53,11 +52,11 @@ local function widget_layout(state, arguments)
         fits = false
     else
         for i = 1, #children do
-            local child, expected = children[i], expected[i]
-            if child._widget ~= expected._widget or
-                child._width ~= expected._width or
-                child._height ~= expected._height or
-                not matrix_equals(child._matrix, expected._matrix) then
+            local child, exp = children[i], expected[i]
+            if child._widget ~= exp._widget or
+                child._width ~= exp._width or
+                child._height ~= exp._height or
+                not matrix_equals(child._matrix, exp._matrix) then
                 fits = false
                 break
             end