diff --git a/build-recipes/win_environment.iss b/build-recipes/win_environment.iss
index bcd414c..542fefc 100644
--- a/build-recipes/win_environment.iss
+++ b/build-recipes/win_environment.iss
@@ -1,3 +1,5 @@
+[Code]
+
 const EnvironmentKey = 'SYSTEM\CurrentControlSet\Control\Session Manager\Environment';
 
 procedure EnvAddPath(Path: string);
diff --git a/build-recipes/win_mpl-data-cast.iss_dummy b/build-recipes/win_mpl-data-cast.iss_dummy
index 88e7680..aff369f 100644
--- a/build-recipes/win_mpl-data-cast.iss_dummy
+++ b/build-recipes/win_mpl-data-cast.iss_dummy
@@ -45,6 +45,8 @@ Name: "german"; MessagesFile: "compiler:Languages\German.isl"
 [Tasks]
 Name: "desktopicon"; Description: "{cm:CreateDesktopIcon}"; GroupDescription: "{cm:AdditionalIcons}"; Flags: unchecked
 
+Name: envPath; Description: "Add to PATH variable (required for mpldc.exe CLI)"
+
 [Files]
 Source: "{#MyAppDir}{#MyAppExeName}"; DestDir: "{app}"; Flags: ignoreversion
 Source: "{#MyAppDir}*"; DestDir: "{app}"; Flags: ignoreversion recursesubdirs createallsubdirs
@@ -115,7 +117,7 @@ begin
       UnInstallOldVersion();
     end;
   end;
-  if CurStep = ssPostInstall then
+  if (CurStep = ssPostInstall) and IsTaskSelected('envPath') then
   begin
     EnvAddPath(ExpandConstant('{app}') +'\bin');
   end;