diff --git a/homeassistant/components/onewire/config_flow.py b/homeassistant/components/onewire/config_flow.py
index f83431111d843..9ad4d5347f0cc 100644
--- a/homeassistant/components/onewire/config_flow.py
+++ b/homeassistant/components/onewire/config_flow.py
@@ -56,7 +56,7 @@ def is_duplicate_owserver_entry(hass: HomeAssistantType, user_input):
         if (
             config_entry.data[CONF_TYPE] == CONF_TYPE_OWSERVER
             and config_entry.data[CONF_HOST] == user_input[CONF_HOST]
-            and config_entry.data[CONF_PORT] == str(user_input[CONF_PORT])
+            and config_entry.data[CONF_PORT] == user_input[CONF_PORT]
         ):
             return True
     return False
diff --git a/tests/components/onewire/__init__.py b/tests/components/onewire/__init__.py
index eb9b42ea996b5..39a3c438cf92f 100644
--- a/tests/components/onewire/__init__.py
+++ b/tests/components/onewire/__init__.py
@@ -48,9 +48,8 @@ async def setup_onewire_owserver_integration(hass):
         data={
             CONF_TYPE: CONF_TYPE_OWSERVER,
             CONF_HOST: "1.2.3.4",
-            CONF_PORT: "1234",
+            CONF_PORT: 1234,
         },
-        unique_id=f"{CONF_TYPE_OWSERVER}:1.2.3.4:1234",
         connection_class=CONN_CLASS_LOCAL_POLL,
         options={},
         entry_id="2",
@@ -74,12 +73,11 @@ async def setup_onewire_patched_owserver_integration(hass):
         data={
             CONF_TYPE: CONF_TYPE_OWSERVER,
             CONF_HOST: "1.2.3.4",
-            CONF_PORT: "1234",
+            CONF_PORT: 1234,
             CONF_NAMES: {
                 "10.111111111111": "My DS18B20",
             },
         },
-        unique_id=f"{CONF_TYPE_OWSERVER}:1.2.3.4:1234",
         connection_class=CONN_CLASS_LOCAL_POLL,
         options={},
         entry_id="2",
diff --git a/tests/components/onewire/test_config_flow.py b/tests/components/onewire/test_config_flow.py
index dfb64a3846ed9..ba0ae090ed2ac 100644
--- a/tests/components/onewire/test_config_flow.py
+++ b/tests/components/onewire/test_config_flow.py
@@ -318,7 +318,7 @@ async def test_import_owserver_with_port(hass):
             data={
                 CONF_TYPE: CONF_TYPE_OWSERVER,
                 CONF_HOST: "1.2.3.4",
-                CONF_PORT: "1234",
+                CONF_PORT: 1234,
             },
         )
     assert result["type"] == RESULT_TYPE_CREATE_ENTRY
@@ -326,8 +326,37 @@ async def test_import_owserver_with_port(hass):
     assert result["data"] == {
         CONF_TYPE: CONF_TYPE_OWSERVER,
         CONF_HOST: "1.2.3.4",
-        CONF_PORT: "1234",
+        CONF_PORT: 1234,
     }
     await hass.async_block_till_done()
     assert len(mock_setup.mock_calls) == 1
     assert len(mock_setup_entry.mock_calls) == 1
+
+
+async def test_import_owserver_duplicate(hass):
+    """Test OWServer flow."""
+    # Initialise with single entry
+    with patch(
+        "homeassistant.components.onewire.async_setup", return_value=True
+    ) as mock_setup, patch(
+        "homeassistant.components.onewire.async_setup_entry",
+        return_value=True,
+    ) as mock_setup_entry:
+        await setup_onewire_owserver_integration(hass)
+        assert len(hass.config_entries.async_entries(DOMAIN)) == 1
+
+    # Import duplicate entry
+    result = await hass.config_entries.flow.async_init(
+        DOMAIN,
+        context={"source": SOURCE_IMPORT},
+        data={
+            CONF_TYPE: CONF_TYPE_OWSERVER,
+            CONF_HOST: "1.2.3.4",
+            CONF_PORT: 1234,
+        },
+    )
+    assert result["type"] == RESULT_TYPE_ABORT
+    assert result["reason"] == "already_configured"
+    await hass.async_block_till_done()
+    assert len(mock_setup.mock_calls) == 1
+    assert len(mock_setup_entry.mock_calls) == 1