diff --git a/install/windows/build-app.bat b/install/windows/build-app.bat
index 1348fb0fc..d4fc50cea 100644
--- a/install/windows/build-app.bat
+++ b/install/windows/build-app.bat
@@ -16,7 +16,7 @@ python install\windows\build-wxs.py
 
 REM build the msi package
 cd build
-wix build -ext WixToolset.UI.wixext .\Dangerzone.wxs -out Dangerzone.msi
+wix build -arch x64 -ext WixToolset.UI.wixext .\Dangerzone.wxs -out Dangerzone.msi
 
 REM validate Dangerzone.msi
 wix msi validate Dangerzone.msi
diff --git a/install/windows/build-wxs.py b/install/windows/build-wxs.py
index bb7fa5223..71e356468 100644
--- a/install/windows/build-wxs.py
+++ b/install/windows/build-wxs.py
@@ -215,7 +215,7 @@ def main():
     programfilesfolder_el = ET.SubElement(
         package_el,
         "StandardDirectory",
-        Id="ProgramFilesFolder",
+        Id="ProgramFiles64Folder",
     )
 
     # Generate the directory layout for the installed product