diff --git a/python/CMakeLists.txt b/python/CMakeLists.txt
index a6e2bdeb1..315f81f4e 100644
--- a/python/CMakeLists.txt
+++ b/python/CMakeLists.txt
@@ -103,4 +103,5 @@ endif()
 set(GTSAM_PYTHON_INSTALL_TARGET python-install)
 add_custom_target(${GTSAM_PYTHON_INSTALL_TARGET}
         COMMAND ${PYTHON_EXECUTABLE} ${GTSAM_PYTHON_BUILD_DIRECTORY}/setup.py install
+        DEPENDS gtsam_py gtsam_unstable_py
         WORKING_DIRECTORY ${GTSAM_PYTHON_BUILD_DIRECTORY})