diff --git a/FlightGear.iss b/FlightGear.iss
index 68ed3dc..4393d94 100755
--- a/FlightGear.iss
+++ b/FlightGear.iss
@@ -67,6 +67,9 @@ UninstallDisplayIcon={app}\bin\fgfs.exe
 ArchitecturesInstallIn64BitMode=x64
 ArchitecturesAllowed=x86 x64
 
+; Sign tool must be defined in the Inno Setup GUI, to avoid
+; exposing the certificate password
+SignTool=fg_code_sign1
 
 [Tasks]
 ; NOTE: The following entry contains English phrases ("Create a desktop icon" and "Additional icons"). You are free to translate them into another language if required.