diff --git a/extensions/CppunitTest_extensions_test_update.mk b/extensions/CppunitTest_extensions_test_update.mk
index da6b83a311b8..6de43bd4e8c5 100644
--- a/extensions/CppunitTest_extensions_test_update.mk
+++ b/extensions/CppunitTest_extensions_test_update.mk
@@ -24,6 +24,7 @@ $(eval $(call gb_CppunitTest_use_libraries,extensions_test_update, \
 	sal \
 	salhelper \
 	test \
+	tk \
 	utl \
 	unotest \
 	vcl \