diff --git a/lib/config/aexpression.h b/lib/config/aexpression.h
index 3da667651..e9382aa2c 100644
--- a/lib/config/aexpression.h
+++ b/lib/config/aexpression.h
@@ -46,7 +46,7 @@ enum AOperator
 /**
  * @ingroup config
  */
-class AExpression : public Object
+class I2_CONFIG_API AExpression : public Object
 {
 public:
 	DECLARE_PTR_TYPEDEFS(AExpression);
diff --git a/lib/config/avalue.cpp b/lib/config/avalue.cpp
index 8b792e0c7..96aa49319 100644
--- a/lib/config/avalue.cpp
+++ b/lib/config/avalue.cpp
@@ -32,7 +32,7 @@ AValue::AValue(const AExpression::Ptr& expr)
 { }
 
 AValue::AValue(AValueType type, const Value& value)
-	: m_Type(type), m_Value(value), m_Expression(NULL)
+	: m_Type(type), m_Value(value)
 { }
 
 Value AValue::Evaluate(const Object::Ptr& thisRef) const
diff --git a/lib/config/avalue.h b/lib/config/avalue.h
index 107940025..132da5b93 100644
--- a/lib/config/avalue.h
+++ b/lib/config/avalue.h
@@ -43,7 +43,7 @@ class AExpression;
 /**
  * @ingroup config
  */
-class AValue
+class I2_CONFIG_API AValue
 {
 public:
 	AValue(void);