diff --git a/cpp/gtsam.h b/cpp/gtsam.h
index 874d1cdf9..3f3a872cb 100644
--- a/cpp/gtsam.h
+++ b/cpp/gtsam.h
@@ -92,7 +92,7 @@ class LinearFactorGraph {
   bool equals(const LinearFactorGraph& lfgraph) const;
 
   VectorConfig optimize(const Ordering& ordering);
-  GaussianBayesNet eliminate(const Ordering& ordering);
+  void eliminate(const Ordering& ordering);
   pair<Matrix,Vector> matrix(const Ordering& ordering) const;
   Matrix sparse(const Ordering& ordering) const;
 };