diff --git a/Installer/Sandboxie-Plus.iss b/Installer/Sandboxie-Plus.iss
index ce45e9bf..9e8303ba 100644
--- a/Installer/Sandboxie-Plus.iss
+++ b/Installer/Sandboxie-Plus.iss
@@ -73,7 +73,7 @@ Name: "{userdesktop}\Sandboxie-Plus"; Filename: "{app}\SandMan.exe"; Tasks: Desk
 
 [INI]
 ; Set Sandman language.
-Filename: "{localappdata}\{#MyAppName}\{#MyAppName}.ini"; Section: "Options"; Key: "UiLanguage"; String: "{code:SandmanLanguage|{language}}"; Check: not IsPortable
+Filename: "{localappdata}\{#MyAppName}\{#MyAppName}.ini"; Section: "Options"; Key: "UiLanguage"; String: "{code:SandmanLanguage|{language}}"; Check: (not IsPortable) and (not IsUpgrade)
 Filename: "{app}\{#MyAppName}.ini"; Section: "Options"; Key: "UiLanguage"; String: "{code:SandmanLanguage|{language}}"; Check: IsPortable