diff --git a/include/osmocom/sgsn/v42bis.h b/include/osmocom/sgsn/v42bis.h
index 607a58e..b64c43e 100644
--- a/include/osmocom/sgsn/v42bis.h
+++ b/include/osmocom/sgsn/v42bis.h
@@ -20,7 +20,7 @@
  *
  * You should have received a copy of the GNU Lesser 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 Street, Fifth Floor, Boston, MA 02110-1301 USA.
  */
 
 /*! \page v42bis_page V.42bis modem data compression
diff --git a/include/osmocom/sgsn/v42bis_private.h b/include/osmocom/sgsn/v42bis_private.h
index daa5ea3..c6b675a 100644
--- a/include/osmocom/sgsn/v42bis_private.h
+++ b/include/osmocom/sgsn/v42bis_private.h
@@ -20,7 +20,7 @@
  *
  * You should have received a copy of the GNU Lesser 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 Street, Fifth Floor, Boston, MA 02110-1301 USA.
  */
 
 #if !defined(_SPANDSP_PRIVATE_V42BIS_H_)