diff --git a/include/wrenpp/detail/meson.build b/include/wrenpp/detail/meson.build
new file mode 100644
index 0000000..37c2629
--- /dev/null
+++ b/include/wrenpp/detail/meson.build
@@ -0,0 +1,15 @@
+include_files = [
+  'construct_foreign_class.hpp',
+  'error_type.hpp',
+  'guess_class_name.hpp',
+  'has_method.hpp',
+  'setters_getters.hpp',
+  'string_bt.hpp',
+  'StringCRC32.hpp',
+  'strings_in_vector.hpp',
+  'wren_types.hpp',
+]
+
+if not meson.is_subproject()
+  install_headers(include_files)
+endif
diff --git a/include/wrenpp/meson.build b/include/wrenpp/meson.build
index d31a8bc..d7bafc6 100644
--- a/include/wrenpp/meson.build
+++ b/include/wrenpp/meson.build
@@ -8,19 +8,8 @@ include_files = [
   'vm.hpp',
 ]
 
-include_files_detail = [
-  'detail/construct_foreign_class.hpp',
-  'detail/error_type.hpp',
-  'detail/guess_class_name.hpp',
-  'detail/has_method.hpp',
-  'detail/setters_getters.hpp',
-  'detail/string_bt.hpp',
-  'detail/StringCRC32.hpp',
-  'detail/strings_in_vector.hpp',
-  'detail/wren_types.hpp',
-]
-
 if not meson.is_subproject()
   install_headers(include_files)
-  install_headers(include_files_detail, subdir: 'detail')
 endif
+
+subdir('detail')