diff --git a/homeassistant/components/fritz/diagnostics.py b/homeassistant/components/fritz/diagnostics.py
index fa4ff6a7db8..ed45295892b 100644
--- a/homeassistant/components/fritz/diagnostics.py
+++ b/homeassistant/components/fritz/diagnostics.py
@@ -22,6 +22,9 @@ async def async_get_config_entry_diagnostics(
         "entry": async_redact_data(entry.as_dict(), TO_REDACT),
         "device_info": {
             "model": avm_wrapper.model,
+            "unique_id": avm_wrapper.unique_id.replace(
+                avm_wrapper.unique_id[6:11], "XX:XX"
+            ),
             "current_firmware": avm_wrapper.current_firmware,
             "latest_firmware": avm_wrapper.latest_firmware,
             "update_available": avm_wrapper.update_available,
diff --git a/tests/components/fritz/test_diagnostics.py b/tests/components/fritz/test_diagnostics.py
index 892210d0844..a4b4942c375 100644
--- a/tests/components/fritz/test_diagnostics.py
+++ b/tests/components/fritz/test_diagnostics.py
@@ -11,7 +11,7 @@ from homeassistant.config_entries import ConfigEntryState
 from homeassistant.core import HomeAssistant
 from homeassistant.setup import async_setup_component
 
-from .const import MOCK_USER_DATA
+from .const import MOCK_MESH_MASTER_MAC, MOCK_USER_DATA
 
 from tests.common import MockConfigEntry
 from tests.components.diagnostics import get_diagnostics_for_config_entry
@@ -69,6 +69,7 @@ async def test_entry_diagnostics(
             "latest_firmware": None,
             "mesh_role": "master",
             "model": "FRITZ!Box 7530 AX",
+            "unique_id": MOCK_MESH_MASTER_MAC.replace("6F:12", "XX:XX"),
             "update_available": False,
             "wan_link_properties": {
                 "NewLayer1DownstreamMaxBitRate": 318557000,