diff --git a/gtsam/nonlinear/IncrementalFixedLagSmoother.h b/gtsam/nonlinear/IncrementalFixedLagSmoother.h
index ca70c3b58..1e4263d4b 100644
--- a/gtsam/nonlinear/IncrementalFixedLagSmoother.h
+++ b/gtsam/nonlinear/IncrementalFixedLagSmoother.h
@@ -22,7 +22,7 @@
 
 #include <gtsam/nonlinear/FixedLagSmoother.h>
 #include <gtsam/nonlinear/ISAM2.h>
-#include "gtsam_unstable/dllexport.h"
+#include "gtsam/dllexport.h"
 
 namespace gtsam {