diff --git a/provides.py b/provides.py
index 4fb65d3..8a5cb1f 100644
--- a/provides.py
+++ b/provides.py
@@ -76,13 +76,14 @@ class MySQLSharedProvides(reactive.Endpoint):
 
     def set_db_connection_info(
             self, relation_id, db_host, password,
-            allowed_units=None, prefix=None, wait_timeout=None):
+            allowed_units=None, prefix=None, wait_timeout=None, db_port=3306):
         # Implementations of shared-db pre-date the json encoded era of
         # interface layers. In order not to have to update dozens of charms,
         # publish in raw data
 
         # No prefix for db_host and wait_timeout
         self.relations[relation_id].to_publish_raw["db_host"] = db_host
+        self.relations[relation_id].to_publish_raw["db_port"] = db_port
         if wait_timeout:
             self.relations[relation_id].to_publish_raw["wait_timeout"] = (
                 wait_timeout)
diff --git a/requires.py b/requires.py
index 74fa9bf..e49a794 100644
--- a/requires.py
+++ b/requires.py
@@ -9,7 +9,7 @@ class MySQLSharedRequires(RelationBase):
 
     # These remote data fields will be automatically mapped to accessors
     # with a basic documentation string provided.
-    auto_accessors = ['access-network', 'db_host',
+    auto_accessors = ['access-network', 'db_host', 'db_port',
                       'ssl_ca', 'ssl_cert', 'ssl_key',
                       'cluster-series-upgrading', 'wait_timeout']
 
diff --git a/unit_tests/test_provides.py b/unit_tests/test_provides.py
index fff19f3..d2ea914 100644
--- a/unit_tests/test_provides.py
+++ b/unit_tests/test_provides.py
@@ -133,6 +133,7 @@ class TestMySQLSharedProvides(test_utils.PatchHelper):
 
     def test_set_db_connection_info_no_prefix(self):
         _pw = "fakepassword"
+        _port = 3306
         self.ep.set_db_connection_info(
             self.fake_relation_id,
             self.ep.ingress_address,
@@ -140,6 +141,23 @@ class TestMySQLSharedProvides(test_utils.PatchHelper):
             allowed_units=self.fake_unit.unit_name)
         _calls = [
             mock.call("db_host", self.ep.ingress_address),
+            mock.call("db_port", _port),
+            mock.call("password", _pw),
+            mock.call("allowed_units", self.fake_unit.unit_name)]
+        self.fake_relation.to_publish_raw.__setitem__.assert_has_calls(_calls)
+
+    def test_set_db_connection_w_port(self):
+        _pw = "fakepassword"
+        _port = 3316
+        self.ep.set_db_connection_info(
+            self.fake_relation_id,
+            self.ep.ingress_address,
+            _pw,
+            allowed_units=self.fake_unit.unit_name,
+            db_port=_port)
+        _calls = [
+            mock.call("db_host", self.ep.ingress_address),
+            mock.call("db_port", _port),
             mock.call("password", _pw),
             mock.call("allowed_units", self.fake_unit.unit_name)]
         self.fake_relation.to_publish_raw.__setitem__.assert_has_calls(_calls)
@@ -147,6 +165,7 @@ class TestMySQLSharedProvides(test_utils.PatchHelper):
     def test_set_db_connection_info_prefixed(self):
         _p = "prefix"
         _pw = "fakepassword"
+        _port = 3306
         self.ep.set_db_connection_info(
             self.fake_relation_id,
             self.ep.ingress_address,
@@ -155,6 +174,7 @@ class TestMySQLSharedProvides(test_utils.PatchHelper):
             prefix=_p)
         _calls = [
             mock.call("db_host", self.ep.ingress_address),
+            mock.call("db_port", _port),
             mock.call("{}_password".format(_p), _pw),
             mock.call("{}_allowed_units".format(_p), self.fake_unit.unit_name)]
         self.fake_relation.to_publish_raw.__setitem__.assert_has_calls(_calls)
@@ -163,6 +183,7 @@ class TestMySQLSharedProvides(test_utils.PatchHelper):
         _wto = 90
         _p = "prefix"
         _pw = "fakepassword"
+        _port = 3306
         self.ep.set_db_connection_info(
             self.fake_relation_id,
             self.ep.ingress_address,
@@ -171,6 +192,7 @@ class TestMySQLSharedProvides(test_utils.PatchHelper):
             prefix=_p, wait_timeout=_wto)
         _calls = [
             mock.call("db_host", self.ep.ingress_address),
+            mock.call("db_port", _port),
             mock.call("wait_timeout", _wto),
             mock.call("{}_password".format(_p), _pw),
             mock.call("{}_allowed_units".format(_p), self.fake_unit.unit_name)]