--- a/data/meson.build
+++ b/data/meson.build
@@ -90,9 +90,6 @@
   install_dir: get_option('datadir') / 'wixl-' + meson.project_version() / 'include'
 )
 
-install_subdir('ext/',
-  install_dir: get_option('datadir') / 'wixl-' + meson.project_version()
-)
 
 if get_option('validate-wxi')
   wxi_validate = find_program('wxi-validate.pl')