diff --git a/cython/eigency/CMakeLists.txt b/cython/eigency/CMakeLists.txt
index fec9a4834..536a01626 100644
--- a/cython/eigency/CMakeLists.txt
+++ b/cython/eigency/CMakeLists.txt
@@ -14,3 +14,4 @@ cythonize(cythonize_eigency_conversions "${CMAKE_CURRENT_SOURCE_DIR}/conversions
 install(DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR} DESTINATION ${GTSAM_CYTHON_INSTALL_PATH})
 install(TARGETS cythonize_eigency_core cythonize_eigency_conversions
         DESTINATION ${GTSAM_CYTHON_INSTALL_PATH}/eigency)
+configure_file(__init__.py.in ${GTSAM_CYTHON_INSTALL_PATH}/eigency/__init__.py)
diff --git a/cython/eigency/__init__.py b/cython/eigency/__init__.py.in
similarity index 85%
rename from cython/eigency/__init__.py
rename to cython/eigency/__init__.py.in
index ae45d13d1..dd278d128 100644
--- a/cython/eigency/__init__.py
+++ b/cython/eigency/__init__.py.in
@@ -1,7 +1,7 @@
 import os
 import numpy as np
 
-__eigen_dir__ = "eigen_3.2.8"
+__eigen_dir__ = "${GTSAM_EIGEN_INCLUDE_PREFIX}"
 
 def get_includes(include_eigen=True):
     root = os.path.dirname(__file__)