diff --git a/simgear/structure/SGPerfMon.cxx b/simgear/structure/SGPerfMon.cxx
index 11968b4c..ae8191b5 100644
--- a/simgear/structure/SGPerfMon.cxx
+++ b/simgear/structure/SGPerfMon.cxx
@@ -16,7 +16,7 @@
 //
 // You should have received a copy of the GNU General Public License
 // along with this program; if not, write to the Free Software
-// Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+// Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301, USA.
 //
 
 #ifdef HAVE_CONFIG_H
diff --git a/simgear/structure/SGPerfMon.hxx b/simgear/structure/SGPerfMon.hxx
index 47492aa7..d7e4ed59 100644
--- a/simgear/structure/SGPerfMon.hxx
+++ b/simgear/structure/SGPerfMon.hxx
@@ -16,7 +16,7 @@
 //
 // You should have received a copy of the GNU General Public License
 // along with this program; if not, write to the Free Software
-// Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+// Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301, USA.
 //
 
 #ifndef __SGPERFMON_HXX