diff --git a/gtsam/base/VectorSpace.h b/gtsam/base/VectorSpace.h
index f4e3d3020..a9e9ca106 100644
--- a/gtsam/base/VectorSpace.h
+++ b/gtsam/base/VectorSpace.h
@@ -185,7 +185,7 @@ template<class Class>
 struct VectorSpaceTraits: VectorSpaceImpl<Class, Class::dimension> {
 
   // Check that Class has the necessary machinery
-  GTSAM_CONCEPT_ASSERT(HasVectorSpacePrereqs<Class>);
+GTSAM_CONCEPT_ASSERT(HasVectorSpacePrereqs<Class>);
 
   typedef vector_space_tag structure_category;
 
diff --git a/gtsam/base/concepts.h b/gtsam/base/concepts.h
index 5159d6f9b..f951329a7 100644
--- a/gtsam/base/concepts.h
+++ b/gtsam/base/concepts.h
@@ -19,7 +19,7 @@
 // This does something sensible:
 #define BOOST_CONCEPT_USAGE(concept) void check##concept()
 // These just ignore the concept checking for now:
-#define GTSAM_CONCEPT_ASSERT(concept)
+#define GTSAM_CONCEPT_ASSERT(concept) void*(concept)
 #define GTSAM_CONCEPT_REQUIRES(concept, return_type) return_type
 #endif
 
diff --git a/gtsam/nonlinear/Expression.h b/gtsam/nonlinear/Expression.h
index 1e977ade1..e5017390d 100644
--- a/gtsam/nonlinear/Expression.h
+++ b/gtsam/nonlinear/Expression.h
@@ -218,7 +218,7 @@ protected:
 template <typename T>
 class ScalarMultiplyExpression : public Expression<T> {
   // Check that T is a vector space
-  GTSAM_CONCEPT_ASSERT(gtsam::IsVectorSpace<T>);
+  GTSAM_CONCEPT_ASSERT(IsVectorSpace<T>);
 
  public:
   explicit ScalarMultiplyExpression(double s, const Expression<T>& e);
@@ -231,7 +231,7 @@ class ScalarMultiplyExpression : public Expression<T> {
 template <typename T>
 class BinarySumExpression : public Expression<T> {
   // Check that T is a vector space
-  GTSAM_CONCEPT_ASSERT(gtsam::IsVectorSpace<T>);
+  GTSAM_CONCEPT_ASSERT(IsVectorSpace<T>);
 
  public:
   explicit BinarySumExpression(const Expression<T>& e1, const Expression<T>& e2);
diff --git a/gtsam/nonlinear/internal/ExpressionNode.h b/gtsam/nonlinear/internal/ExpressionNode.h
index 1f45f7a87..de0c9721e 100644
--- a/gtsam/nonlinear/internal/ExpressionNode.h
+++ b/gtsam/nonlinear/internal/ExpressionNode.h
@@ -561,7 +561,7 @@ public:
 template <class T>
 class ScalarMultiplyNode : public ExpressionNode<T> {
   // Check that T is a vector space
-  GTSAM_CONCEPT_ASSERT(gtsam::IsVectorSpace<T>);
+  GTSAM_CONCEPT_ASSERT(IsVectorSpace<T>);
 
   double scalar_;
   std::shared_ptr<ExpressionNode<T> > expression_;