diff --git a/tests/harness/meson.build b/tests/harness/meson.build
index 41cc44b48..2b62945ae 100644
--- a/tests/harness/meson.build
+++ b/tests/harness/meson.build
@@ -69,6 +69,7 @@ lib_test_client = static_library(
 dep_test_client = declare_dependency(
 	link_with: lib_test_client,
 	sources: [
+		weston_test_client_protocol_h,
 		viewporter_client_protocol_h,
 	],
 	dependencies: [
diff --git a/tests/meson.build b/tests/meson.build
index 29c206c5c..d0037b38c 100644
--- a/tests/meson.build
+++ b/tests/meson.build
@@ -319,7 +319,6 @@ endif
 foreach t : tests
 	t_name = 'test-' + t.get('name')
 	t_sources = t.get('sources', [t.get('name') + '-test.c'])
-	t_sources += weston_test_client_protocol_h
 
 	t_deps = [ dep_test_client, dep_libweston_private_h ]
 	t_deps += t.get('dep_objs', [])