diff --git a/src/serialize.h b/src/serialize.h
index 2d4aaba6a..d34f3e557 100644
--- a/src/serialize.h
+++ b/src/serialize.h
@@ -20,6 +20,7 @@
 #include <boost/tuple/tuple_io.hpp>
 
 #include "allocators.h"
+#include "version.h"
 
 typedef long long  int64;
 typedef unsigned long long  uint64;
@@ -29,8 +30,6 @@ class CDataStream;
 class CAutoFile;
 static const unsigned int MAX_SIZE = 0x02000000;
 
-static const int PROTOCOL_VERSION = 60000;
-
 // Used to bypass the rule against non-const reference to temporary
 // where it makes sense with wrappers such as CFlatData or CTxDB
 template<typename T>
diff --git a/src/version.cpp b/src/version.cpp
index e1be5f491..0c1e8bfa8 100644
--- a/src/version.cpp
+++ b/src/version.cpp
@@ -11,18 +11,8 @@
 const std::string CLIENT_NAME("Satoshi");
 
 // Client version number
-#define CLIENT_VERSION_MAJOR          0
-#define CLIENT_VERSION_MINOR          6
-#define CLIENT_VERSION_REVISION       0
-#define CLIENT_VERSION_BUILD         99
 #define CLIENT_VERSION_SUFFIX   "-beta"
 
-const int CLIENT_VERSION = 1000000 * CLIENT_VERSION_MAJOR
-                         +   10000 * CLIENT_VERSION_MINOR 
-                         +     100 * CLIENT_VERSION_REVISION
-                         +       1 * CLIENT_VERSION_BUILD;
-
-
 
 // The following part of the code determines the CLIENT_BUILD variable.
 // Several mechanisms are used for this:
diff --git a/src/version.h b/src/version.h
index e0e216aad..1ea1a0dbb 100644
--- a/src/version.h
+++ b/src/version.h
@@ -6,12 +6,32 @@
 
 #include <string>
 
+//
+// client versioning
+//
+
+static const int CLIENT_VERSION_MAJOR       =  0;
+static const int CLIENT_VERSION_MINOR       =  6;
+static const int CLIENT_VERSION_REVISION    =  0;
+static const int CLIENT_VERSION_BUILD       = 99;
+
+static const int CLIENT_VERSION =
+                           1000000 * CLIENT_VERSION_MAJOR
+                         +   10000 * CLIENT_VERSION_MINOR 
+                         +     100 * CLIENT_VERSION_REVISION
+                         +       1 * CLIENT_VERSION_BUILD;
+
 extern const std::string CLIENT_NAME;
 extern const std::string CLIENT_BUILD;
 extern const std::string CLIENT_DATE;
-extern const int         CLIENT_VERSION;
+
+//
+// network protocol versioning
+//
+
+static const int PROTOCOL_VERSION = 60000;
 
 // BIP 0031, pong message, is enabled for all versions AFTER this one
-const int BIP0031_VERSION = 60000;
+static const int BIP0031_VERSION = 60000;
 
 #endif