diff --git a/Lts/DDS/DdsUnitTestsPlaceholder/CMakeLists.txt b/Lts/DDS/DdsUnitTestsPlaceholder/CMakeLists.txt
index c2606bd89..fb537aa4e 100644
--- a/Lts/DDS/DdsUnitTestsPlaceholder/CMakeLists.txt
+++ b/Lts/DDS/DdsUnitTestsPlaceholder/CMakeLists.txt
@@ -59,19 +59,19 @@ if(BUILD_TESTING)
     if(TARGET GTest::gtest_main OR TARGET gtest_main)
       # Generic data tests gtest
       if(NOT TARGET ddsGenericDataTests)
-        add_executable(ddsGenericDataTests_gtest ddsGenericDataTests_gtest.cpp)
+        add_executable(ddsGenericDataTests_gtest ddsGenericDataTests_gtest.cpp mocks/MockDDS.cpp)
         target_link_libraries(ddsGenericDataTests_gtest PRIVATE GTest::gtest_main)
         add_test(NAME ddsGenericDataTests_gtest COMMAND $<TARGET_FILE:ddsGenericDataTests_gtest>)
       endif()
 
       if(NOT TARGET ddsDataTopicTests)
-        add_executable(ddsDataTopicTests_gtest ddsDataTopicTests_gtest.cpp)
+        add_executable(ddsDataTopicTests_gtest ddsDataTopicTests_gtest.cpp mocks/MockDDS.cpp)
         target_link_libraries(ddsDataTopicTests_gtest PRIVATE GTest::gtest_main)
         add_test(NAME ddsDataTopicTests_gtest COMMAND $<TARGET_FILE:ddsDataTopicTests_gtest>)
       endif()
 
       if(NOT TARGET ddsFunctionTopicTests)
-        add_executable(ddsFunctionTopicTests_gtest ddsFunctionTopicTests_gtest.cpp)
+        add_executable(ddsFunctionTopicTests_gtest ddsFunctionTopicTests_gtest.cpp mocks/MockDDS.cpp)
         target_link_libraries(ddsFunctionTopicTests_gtest PRIVATE GTest::gtest_main)
         add_test(NAME ddsFunctionTopicTests_gtest COMMAND $<TARGET_FILE:ddsFunctionTopicTests_gtest>)
       endif()