diff --git a/src/python_pybind11/CMakeLists.txt b/src/python_pybind11/CMakeLists.txt
index 368b39cc..af81f33f 100644
--- a/src/python_pybind11/CMakeLists.txt
+++ b/src/python_pybind11/CMakeLists.txt
@@ -9,9 +9,6 @@ if(CMAKE_SOURCE_DIR STREQUAL CMAKE_CURRENT_SOURCE_DIR)
   set(PROJECT_LIBRARY_TARGET_NAME "gz-math${PROJECT_VERSION_MAJOR}::gz-math${PROJECT_VERSION_MAJOR}")
   include(GNUInstallDirs)
   include(CTest)
-  if(BUILD_TESTING)
-    enable_testing()
-  endif()
 endif()
 
 message(STATUS "Building pybind11 interfaces")