diff --git a/gtsam/config.h.in b/gtsam/config.h.in
index 365e8eda0..8433f19b0 100644
--- a/gtsam/config.h.in
+++ b/gtsam/config.h.in
@@ -71,6 +71,3 @@
 
 // Support Metis-based nested dissection
 #cmakedefine GTSAM_TANGENT_PREINTEGRATION
-
-// For Cython wrapper: Whether we are using system-Eigency or our own copied version
-#cmakedefine GTSAM_USE_SYSTEM_EIGENCY