diff --git a/gtsam/discrete/DiscreteKey.h b/gtsam/discrete/DiscreteKey.h
index ce0c56dbe..dea00074d 100644
--- a/gtsam/discrete/DiscreteKey.h
+++ b/gtsam/discrete/DiscreteKey.h
@@ -72,5 +72,5 @@ namespace gtsam {
   }; // DiscreteKeys
 
   /// Create a list from two keys
-  DiscreteKeys operator&(const DiscreteKey& key1, const DiscreteKey& key2);
+  GTSAM_EXPORT DiscreteKeys operator&(const DiscreteKey& key1, const DiscreteKey& key2);
 }
diff --git a/gtsam_unstable/discrete/Constraint.h b/gtsam_unstable/discrete/Constraint.h
index 4ee7b85eb..168891e6f 100644
--- a/gtsam_unstable/discrete/Constraint.h
+++ b/gtsam_unstable/discrete/Constraint.h
@@ -34,7 +34,7 @@ using Domains = std::map<Key, Domain>;
  * Base class for constraint factors
  * Derived classes include SingleValue, BinaryAllDiff, and AllDiff.
  */
-class GTSAM_EXPORT Constraint : public DiscreteFactor {
+class GTSAM_UNSTABLE_EXPORT Constraint : public DiscreteFactor {
  public:
   typedef boost::shared_ptr<Constraint> shared_ptr;