diff --git a/platform/tests/UNITTESTS/doubles/CMakeLists.txt b/platform/tests/UNITTESTS/doubles/CMakeLists.txt
index e3c21e5..3b6c440 100644
--- a/platform/tests/UNITTESTS/doubles/CMakeLists.txt
+++ b/platform/tests/UNITTESTS/doubles/CMakeLists.txt
@@ -32,6 +32,7 @@
         nvic_wrapper_stub.c
         randLIB_stub.c
         randLIB_stub.cpp
+        ../../../source/SingletonPtr.cpp
 )
 target_include_directories(mbed-stubs-platform
     PUBLIC