diff --git a/gtsam/inference/BayesTreeCliqueBase-inst.h b/gtsam/inference/BayesTreeCliqueBase-inst.h
index dfcc7c318..6da7d0fe4 100644
--- a/gtsam/inference/BayesTreeCliqueBase-inst.h
+++ b/gtsam/inference/BayesTreeCliqueBase-inst.h
@@ -17,6 +17,7 @@
 #pragma once
 
 #include <gtsam/inference/BayesTreeCliqueBase.h>
+#include <gtsam/inference/FactorGraph-inst.h>
 #include <gtsam/base/timing.h>
 
 namespace gtsam {