diff --git a/include/boost/system/error_code.hpp b/include/boost/system/error_code.hpp
index 8dd800b..74afdd2 100644
--- a/include/boost/system/error_code.hpp
+++ b/include/boost/system/error_code.hpp
@@ -146,11 +146,11 @@ namespace boost
     {
     public:
       virtual ~error_category(){}
-      virtual const char *    name() const;  // see implementation note below
-      virtual std::string     message( int ev ) const;   // see implementation note below
-      virtual error_condition default_error_condition( int ev ) const;
-      virtual bool equivalent( int code, const error_condition & condition ) const;
-      virtual bool equivalent( const error_code & code, int condition ) const;
+      virtual inline const char *    name() const;  // see implementation note below
+      virtual inline std::string     message( int ev ) const;   // see implementation note below
+      virtual inline error_condition default_error_condition( int ev ) const;
+      virtual inline bool equivalent( int code, const error_condition & condition ) const;
+      virtual inline bool equivalent( const error_code & code, int condition ) const;
 
       bool operator==(const error_category & rhs) const { return this == &rhs; }
       bool operator!=(const error_category & rhs) const { return this != &rhs; }
diff --git a/src/error_code.cpp b/src/error_code.cpp
index 8cebf28..2515be8 100644
--- a/src/error_code.cpp
+++ b/src/error_code.cpp
@@ -50,6 +50,7 @@ namespace
   class posix_error_category : public error_category
   {
   public:
+    posix_error_category(){}
     const char *   name() const;
     std::string    message( int ev ) const;
   };
@@ -57,6 +58,7 @@ namespace
   class system_error_category : public error_category
   {
   public:
+    system_error_category(){}
     const char *        name() const;
     std::string         message( int ev ) const;
     error_condition     default_error_condition( int ev ) const;