diff --git a/src/libexpr-c/meson.build b/src/libexpr-c/meson.build
index 7c11ca9cb..ed4582e40 100644
--- a/src/libexpr-c/meson.build
+++ b/src/libexpr-c/meson.build
@@ -37,13 +37,11 @@ include_dirs = [include_directories('.')]
 
 headers = files(
   'nix_api_expr.h',
+  'nix_api_expr_internal.h',
   'nix_api_external.h',
   'nix_api_value.h',
 )
 
-# TODO move this header to libexpr, maybe don't use it in tests?
-headers += files('nix_api_expr_internal.h')
-
 subdir('nix-meson-build-support/export-all-symbols')
 subdir('nix-meson-build-support/windows-version')