diff --git a/net/auth/src/TRootSecContext.cxx b/net/auth/src/TRootSecContext.cxx
index 589f4163cd68bdde0aa3662791895b4f8a4e6cc7..34e3647889690ceb637365c215953610e57da80e 100644
--- a/net/auth/src/TRootSecContext.cxx
+++ b/net/auth/src/TRootSecContext.cxx
@@ -28,8 +28,6 @@
 #include "TUrl.h"
 #include "TVirtualMutex.h"
 
-const TDatime kROOTTZERO = 788914800;
-
 ClassImp(TRootSecContext);
 
 ////////////////////////////////////////////////////////////////////////////////
diff --git a/net/net/inc/TSecContext.h b/net/net/inc/TSecContext.h
index 6925bf96c78486b016e3172739805ae4e566b779..fd7405af1c5650c7298e450900bf4a81469d0105 100644
--- a/net/net/inc/TSecContext.h
+++ b/net/net/inc/TSecContext.h
@@ -27,7 +27,7 @@
 #include "TDatime.h"
 
 // Jan 1, 1995, 00:00:00 in sec from EPOCH (Jan 1, 1970)
-extern const TDatime kROOTTZERO;
+R__EXTERN const TDatime kROOTTZERO;
 
 // Small class with information for final cleanup
 class TSecContextCleanup;