diff --git a/gtsam/hybrid/HybridConditional.h b/gtsam/hybrid/HybridConditional.h
index 0009d6bd8..51eeeb5bb 100644
--- a/gtsam/hybrid/HybridConditional.h
+++ b/gtsam/hybrid/HybridConditional.h
@@ -186,7 +186,7 @@ class GTSAM_EXPORT HybridConditional
    * @return AlgebraicDecisionTree<Key> A decision tree with the same keys
    * as the conditionals involved, and leaf values as the error.
    */
-  virtual AlgebraicDecisionTree<Key> errorTree(
+  AlgebraicDecisionTree<Key> errorTree(
       const VectorValues& values) const override;
 
   /// Return the log-probability (or density) of the underlying conditional.
diff --git a/gtsam/hybrid/HybridGaussianFactor.h b/gtsam/hybrid/HybridGaussianFactor.h
index 8d57ad7da..3bf9f3dfd 100644
--- a/gtsam/hybrid/HybridGaussianFactor.h
+++ b/gtsam/hybrid/HybridGaussianFactor.h
@@ -148,7 +148,7 @@ class GTSAM_EXPORT HybridGaussianFactor : public HybridFactor {
    * @return AlgebraicDecisionTree<Key> A decision tree with the same keys
    * as the factors involved, and leaf values as the error.
    */
-  virtual AlgebraicDecisionTree<Key> errorTree(
+  AlgebraicDecisionTree<Key> errorTree(
       const VectorValues &continuousValues) const override;
 
   /**