diff --git a/cython/CMakeLists.txt b/cython/CMakeLists.txt
index 01b6c06d4..2bfa8ae7c 100644
--- a/cython/CMakeLists.txt
+++ b/cython/CMakeLists.txt
@@ -47,6 +47,7 @@ if (GTSAM_INSTALL_CYTHON_TOOLBOX)
   # Add the new make target command
   add_custom_target(python-install
     COMMAND ${PYTHON_EXECUTABLE} ${GTSAM_CYTHON_INSTALL_PATH}${GTSAM_BUILD_TAG}/setup.py install
+    DEPENDS gtsam
     WORKING_DIRECTORY ${GTSAM_CYTHON_INSTALL_FULLPATH})
 
 endif ()