diff --git a/testing/CMakeLists.txt b/testing/CMakeLists.txt
index dcccb6f09..5e3759f2c 100644
--- a/testing/CMakeLists.txt
+++ b/testing/CMakeLists.txt
@@ -20,5 +20,5 @@
 #
 # ##############################################################################
 
-nuttx_add_subdirectory()
+nuttx_add_subdirectory(EXCLUDE cxx-oot-build)
 nuttx_generate_kconfig(MENUDESC "Testing")
diff --git a/testing/cxx-oot-build/CMakeLists.txt b/testing/cxx-oot-build/CMakeLists.txt
index d60dc3662..b3b89d6a8 100644
--- a/testing/cxx-oot-build/CMakeLists.txt
+++ b/testing/cxx-oot-build/CMakeLists.txt
@@ -22,37 +22,29 @@
 
 cmake_minimum_required(VERSION 3.12...3.31)
 
-# --- Guard option ---
-option(BUILD_OOTCPP "Build the Out Of Tree C++ project" OFF)
+project(
+  OOTCpp
+  VERSION 1.0
+  DESCRIPTION "Out Of Tree Build C++ NuttX")
 
-if(BUILD_OOTCPP)
-  project(
-    OOTCpp
-    VERSION 1.0
-    DESCRIPTION "Out Of Tree Build C++ NuttX")
+message(STATUS "Building OOTCpp project")
 
-  message(STATUS "Building OOTCpp project")
+set(CMAKE_CXX_STANDARD 17)
+set(CMAKE_CXX_STANDARD_REQUIRED ON)
 
-  set(CMAKE_CXX_STANDARD 17)
-  set(CMAKE_CXX_STANDARD_REQUIRED ON)
+set(SOURCE_FILES ${CMAKE_SOURCE_DIR}/src/HelloWorld.cpp
+                 ${CMAKE_SOURCE_DIR}/src/main.cpp)
 
-  set(SOURCE_FILES ${CMAKE_SOURCE_DIR}/src/HelloWorld.cpp
-                   ${CMAKE_SOURCE_DIR}/src/main.cpp)
+set(EXE_NAME oot)
 
-  set(EXE_NAME oot)
+add_executable(${EXE_NAME} ${SOURCE_FILES})
 
-  add_executable(${EXE_NAME} ${SOURCE_FILES})
+target_include_directories(${EXE_NAME} PRIVATE ${CMAKE_SOURCE_DIR}/include)
 
-  target_include_directories(${EXE_NAME} PRIVATE ${CMAKE_SOURCE_DIR}/include)
-
-  # Generate a .bin file from the ELF after build
-  add_custom_command(
-    TARGET ${EXE_NAME}
-    POST_BUILD
-    COMMAND ${CMAKE_OBJCOPY} -S -O binary ${CMAKE_BINARY_DIR}/${EXE_NAME}
-            ${CMAKE_BINARY_DIR}/${EXE_NAME}.bin
-    COMMENT "Generating binary image ${EXE_NAME}.bin")
-
-else()
-  message(STATUS "Skipping OOTCpp project")
-endif()
+# Generate a .bin file from the ELF after build
+add_custom_command(
+  TARGET ${EXE_NAME}
+  POST_BUILD
+  COMMAND ${CMAKE_OBJCOPY} -S -O binary ${CMAKE_BINARY_DIR}/${EXE_NAME}
+          ${CMAKE_BINARY_DIR}/${EXE_NAME}.bin
+  COMMENT "Generating binary image ${EXE_NAME}.bin")