diff --git a/tests/CMakeLists.txt b/tests/CMakeLists.txt
index ab9dd697..b9a492a3 100644
--- a/tests/CMakeLists.txt
+++ b/tests/CMakeLists.txt
@@ -71,6 +71,7 @@ else()
 endif()
 
 find_package(PythonInterp REQUIRED)
+set(CXXTEST_PYTHON_TESTGEN_EXECUTABLE ${CMAKE_CURRENT_BINARY_DIR}/cxxtest-download-prefix/src/cxxtest-download/bin/cxxtestgen)
 
 add_custom_command(OUTPUT ${RUNNER}
     COMMAND ${CXXTEST_PYTHON_TESTGEN_EXECUTABLE} --runner=ErrorPrinter -o ${RUNNER} ${TESTS}
diff --git a/third-party/cxxtest/CMakeLists.txt b/third-party/cxxtest/CMakeLists.txt
index 18d27c62..6f50bdf1 100644
--- a/third-party/cxxtest/CMakeLists.txt
+++ b/third-party/cxxtest/CMakeLists.txt
@@ -13,5 +13,3 @@ ExternalProject_Add(cxxtest-download
 
 set(CXXTEST_ROOT_DIR ${CMAKE_CURRENT_BINARY_DIR}/cxxtest-download-prefix/src/cxxtest-download)
 set(CXXTEST_INCLUDE_DIR ${CXXTEST_ROOT_DIR})
-set(CXXTEST_PYTHON_TESTGEN_EXECUTABLE ${CXXTEST_ROOT_DIR}/bin/cxxtestgen CACHE INTERNAL "" FORCE)
-