diff --git a/gtsam_unstable/nonlinear/IncrementalFixedLagSmoother.h b/gtsam_unstable/nonlinear/IncrementalFixedLagSmoother.h
index 8a14d60c2..20747324a 100644
--- a/gtsam_unstable/nonlinear/IncrementalFixedLagSmoother.h
+++ b/gtsam_unstable/nonlinear/IncrementalFixedLagSmoother.h
@@ -22,7 +22,7 @@
 
 #include <gtsam/nonlinear/FixedLagSmoother.h>
 #include <gtsam/nonlinear/ISAM2.h>
-#include "<gtsam_unstable/dllexport.h>"
+#include "gtsam_unstable/dllexport.h"
 
 namespace gtsam {