diff --git a/frontend/apps/reader/modules/readerlink.lua b/frontend/apps/reader/modules/readerlink.lua
index bb6fdcccd..3811aa27d 100644
--- a/frontend/apps/reader/modules/readerlink.lua
+++ b/frontend/apps/reader/modules/readerlink.lua
@@ -1593,7 +1593,7 @@ function ReaderLink:getButtonsForExternalLinkDialog(link_url)
         local button = fn_button(self, link_url)
         local show, button_title
 
-        if type(button.show_in_dialog_func) == "function" then
+        if button.show_in_dialog_func then
             show, button_title = button.show_in_dialog_func(link_url)
         else
             -- If the button doesn't have the show_in_dialog_func, then assume that the button
diff --git a/frontend/ui/widget/button.lua b/frontend/ui/widget/button.lua
index 7e5623d55..09b752956 100644
--- a/frontend/ui/widget/button.lua
+++ b/frontend/ui/widget/button.lua
@@ -80,7 +80,7 @@ function Button:init()
     end
 
     -- Prefer an optional text_func over text
-    if self.text_func and type(self.text_func) == "function" then
+    if self.text_func then
         self.text = self.text_func()
     end
 
@@ -507,7 +507,7 @@ function Button:onTapSelectButton()
             end
         elseif self.tap_input then
             self:onInput(self.tap_input)
-        elseif type(self.tap_input_func) == "function" then
+        elseif self.tap_input_func then
             self:onInput(self.tap_input_func())
         end
     end
@@ -546,7 +546,7 @@ function Button:onHoldSelectButton()
         elseif self.hold_input then
             self:onInput(self.hold_input, true)
             self._hold_handled = true
-        elseif type(self.hold_input_func) == "function" then
+        elseif self.hold_input_func then
             self:onInput(self.hold_input_func(), true)
             self._hold_handled = true
         end
diff --git a/frontend/ui/widget/checkbutton.lua b/frontend/ui/widget/checkbutton.lua
index 71168d36e..4346cff25 100644
--- a/frontend/ui/widget/checkbutton.lua
+++ b/frontend/ui/widget/checkbutton.lua
@@ -127,7 +127,7 @@ function CheckButton:onTapCheckButton()
     if not self.enabled then return true end
     if self.tap_input then
         self:onInput(self.tap_input)
-    elseif type(self.tap_input_func) == "function" then
+    elseif self.tap_input_func then
         self:onInput(self.tap_input_func())
     else
         if G_reader_settings:isFalse("flash_ui") then
@@ -184,7 +184,7 @@ function CheckButton:onHoldCheckButton()
         elseif self.hold_input then
             self:onInput(self.hold_input, true)
             self._hold_handled = true
-        elseif type(self.hold_input_func) == "function" then
+        elseif self.hold_input_func then
             self:onInput(self.hold_input_func(), true)
             self._hold_handled = true
         end
diff --git a/frontend/ui/widget/iconbutton.lua b/frontend/ui/widget/iconbutton.lua
index de887b9c1..471430caf 100644
--- a/frontend/ui/widget/iconbutton.lua
+++ b/frontend/ui/widget/iconbutton.lua
@@ -152,7 +152,7 @@ function IconButton:onHoldIconButton()
         self.hold_callback()
     elseif self.hold_input then
         self:onInput(self.hold_input)
-    elseif type(self.hold_input_func) == "function" then
+    elseif self.hold_input_func then
         self:onInput(self.hold_input_func())
     elseif not self.hold_callback then -- nil or false
         return