diff --git a/homeassistant/components/soundtouch/media_player.py b/homeassistant/components/soundtouch/media_player.py
index 1d82c38d088..2f64a2d3605 100644
--- a/homeassistant/components/soundtouch/media_player.py
+++ b/homeassistant/components/soundtouch/media_player.py
@@ -437,15 +437,25 @@ class SoundTouchDevice(MediaPlayerDevice):
         # slaves for some reason. To compensate for this shortcoming we have to fetch
         # the zone info from the master when the current device is a slave until this is
         # fixed in the SoundTouch API or libsoundtouch, or of course until somebody has a
-        # better idea on how to fix this
-        if zone_status.is_master:
+        # better idea on how to fix this.
+        # In addition to this shortcoming, libsoundtouch seems to report the "is_master"
+        # property wrong on some slaves, so the only reliable way to detect if the current
+        # devices is the master, is by comparing the master_id of the zone with the device_id
+        if zone_status.master_id == self._device.config.device_id:
             return self._build_zone_info(self.entity_id, zone_status.slaves)
 
-        master_instance = self._get_instance_by_ip(zone_status.master_ip)
-        master_zone_status = master_instance.device.zone_status()
-        return self._build_zone_info(
-            master_instance.entity_id, master_zone_status.slaves
-        )
+        # The master device has to be searched by it's ID and not IP since libsoundtouch / BOSE API
+        # do not return the IP of the master for some slave objects/responses
+        master_instance = self._get_instance_by_id(zone_status.master_id)
+        if master_instance is not None:
+            master_zone_status = master_instance.device.zone_status()
+            return self._build_zone_info(
+                master_instance.entity_id, master_zone_status.slaves
+            )
+
+        # We should never end up here since this means we haven't found a master device to get the
+        # correct zone info from. In this case, assume current device is master
+        return self._build_zone_info(self.entity_id, zone_status.slaves)
 
     def _get_instance_by_ip(self, ip_address):
         """Search and return a SoundTouchDevice instance by it's IP address."""
@@ -454,6 +464,13 @@ class SoundTouchDevice(MediaPlayerDevice):
                 return instance
         return None
 
+    def _get_instance_by_id(self, instance_id):
+        """Search and return a SoundTouchDevice instance by it's ID (aka MAC address)."""
+        for instance in self.hass.data[DATA_SOUNDTOUCH]:
+            if instance and instance.device.config.device_id == instance_id:
+                return instance
+        return None
+
     def _build_zone_info(self, master, zone_slaves):
         """Build the exposed zone attributes."""
         slaves = []
diff --git a/tests/components/soundtouch/test_media_player.py b/tests/components/soundtouch/test_media_player.py
index e69cec12ba3..ea580656b24 100644
--- a/tests/components/soundtouch/test_media_player.py
+++ b/tests/components/soundtouch/test_media_player.py
@@ -33,6 +33,8 @@ from homeassistant.setup import async_setup_component
 
 DEVICE_1_IP = "192.168.0.1"
 DEVICE_2_IP = "192.168.0.2"
+DEVICE_1_ID = 1
+DEVICE_2_ID = 2
 
 
 def get_config(host=DEVICE_1_IP, port=8090, name="soundtouch"):
@@ -60,20 +62,22 @@ def one_device_fixture():
 def two_zones_fixture():
     """Mock one master and one slave."""
     device_1 = MockDevice(
+        DEVICE_1_ID,
         MockZoneStatus(
             is_master=True,
-            master_id=1,
+            master_id=DEVICE_1_ID,
             master_ip=DEVICE_1_IP,
             slaves=[MockZoneSlave(DEVICE_2_IP)],
-        )
+        ),
     )
     device_2 = MockDevice(
+        DEVICE_2_ID,
         MockZoneStatus(
             is_master=False,
-            master_id=1,
+            master_id=DEVICE_1_ID,
             master_ip=DEVICE_1_IP,
             slaves=[MockZoneSlave(DEVICE_2_IP)],
-        )
+        ),
     )
     devices = {DEVICE_1_IP: device_1, DEVICE_2_IP: device_2}
     device_patch = patch(
@@ -112,9 +116,9 @@ async def setup_soundtouch(hass, config):
 class MockDevice(STD):
     """Mock device."""
 
-    def __init__(self, zone_status=None):
+    def __init__(self, id=None, zone_status=None):
         """Init the class."""
-        self._config = MockConfig()
+        self._config = MockConfig(id)
         self._zone_status = zone_status or MockZoneStatus()
 
     def zone_status(self, refresh=True):
@@ -125,9 +129,10 @@ class MockDevice(STD):
 class MockConfig(Config):
     """Mock config."""
 
-    def __init__(self):
+    def __init__(self, id=None):
         """Init class."""
         self._name = "name"
+        self._id = id or DEVICE_1_ID
 
 
 class MockZoneStatus(ZoneStatus):