diff --git a/python/CMakeLists.txt b/python/CMakeLists.txt
index b39e067b0..f42e330b2 100644
--- a/python/CMakeLists.txt
+++ b/python/CMakeLists.txt
@@ -181,5 +181,5 @@ add_custom_target(
           ${CMAKE_COMMAND} -E env # add package to python path so no need to install
           "PYTHONPATH=${GTSAM_PYTHON_BUILD_DIRECTORY}/$ENV{PYTHONPATH}"
           ${PYTHON_EXECUTABLE} -m unittest discover -v -s .
-          DEPENDS ${GTSAM_PYTHON_DEPENDENCIES}
+          DEPENDS ${GTSAM_PYTHON_DEPENDENCIES} ${GTSAM_PYTHON_TEST_FILES}
           WORKING_DIRECTORY "${GTSAM_PYTHON_BUILD_DIRECTORY}/gtsam/tests")