diff --git a/gtsam/linear/ConjugateGradientSolver-inl.h b/gtsam/linear/ConjugateGradientSolver-inl.h
index cc3b33079..9dd0b35c1 100644
--- a/gtsam/linear/ConjugateGradientSolver-inl.h
+++ b/gtsam/linear/ConjugateGradientSolver-inl.h
@@ -7,4 +7,4 @@
 
 #pragma once
 
-#include <gtsam/ConjugateGradientSolver.h>
+#include <gtsam/linear/ConjugateGradientSolver.h>