diff --git a/plugin/Trans.lua b/plugin/Trans.lua
index a4573e4..3cc1992 100644
--- a/plugin/Trans.lua
+++ b/plugin/Trans.lua
@@ -24,12 +24,16 @@ string.width = api.nvim_strwidth
 
 local system = Trans.system
 local f =
-    (vim.fn.has 'wsl' or system == 'win') and 'powershell.exe -Command "Add-Type -AssemblyName System.speech;(New-Object System.Speech.Synthesis.SpeechSynthesizer).Speak(\\\"%s\\\")"' or
+    (vim.fn.has 'wsl' == 1 or system == 'win') and
+    'powershell.exe -Command "Add-Type -AssemblyName System.speech;(New-Object System.Speech.Synthesis.SpeechSynthesizer).Speak(\\\"%s\\\")"' or
     system == 'mac' and 'say %q' or
     system == 'termux' and 'termux-tts-speak %q' or
-    system == 'linux' and 'echo %q | festival --tts'
+    system == 'linux' and 'echo %q | festival --tts' or
+    error 'Unsupported system'
+
 
 string.play = function(self)
-    local s = string.gsub(self, "\"", " ")
+    ---@diagnostic disable-next-line: param-type-mismatch
+    local s = string.gsub(self, '\"', ' ')
     fn.jobstart(f:format(s))
 end