diff --git a/homeassistant/components/tankerkoenig/__init__.py b/homeassistant/components/tankerkoenig/__init__.py
index 3f654f245228f1..b9a75b92bde558 100755
--- a/homeassistant/components/tankerkoenig/__init__.py
+++ b/homeassistant/components/tankerkoenig/__init__.py
@@ -27,16 +27,16 @@
 DEFAULT_SCAN_INTERVAL = timedelta(minutes=30)
 
 
-def uuid4_string(value):
-    """Validate a v4 UUID in string format."""
+def uuid_string(value):
+    """Validate a UUID in string format."""
     try:
-        result = UUID(value, version=4)
+        result = UUID(value)
     except (ValueError, AttributeError, TypeError) as error:
-        raise vol.Invalid("Invalid Version4 UUID", error_message=str(error))
+        raise vol.Invalid("Invalid UUID", error_message=str(error))
 
     if str(result) != value.lower():
         # UUID() will create a uuid4 if input is invalid
-        raise vol.Invalid("Invalid Version4 UUID")
+        raise vol.Invalid("Invalid UUID")
 
     return str(result)
 
@@ -45,7 +45,7 @@ def uuid4_string(value):
     {
         DOMAIN: vol.Schema(
             {
-                vol.Required(CONF_API_KEY): uuid4_string,
+                vol.Required(CONF_API_KEY): uuid_string,
                 vol.Optional(
                     CONF_SCAN_INTERVAL, default=DEFAULT_SCAN_INTERVAL
                 ): cv.time_period,
@@ -66,7 +66,7 @@ def uuid4_string(value):
                     cv.positive_int, vol.Range(min=1)
                 ),
                 vol.Optional(CONF_STATIONS, default=[]): vol.All(
-                    cv.ensure_list, [uuid4_string]
+                    cv.ensure_list, [uuid_string]
                 ),
             }
         )
diff --git a/tests/components/tankerkoenig/test_tankerkoenig_validators.py b/tests/components/tankerkoenig/test_tankerkoenig_validators.py
index 7dba88b24fb30a..84fc16ba24e4a3 100755
--- a/tests/components/tankerkoenig/test_tankerkoenig_validators.py
+++ b/tests/components/tankerkoenig/test_tankerkoenig_validators.py
@@ -5,28 +5,20 @@
 import pytest
 import voluptuous as vol
 
-from homeassistant.components.tankerkoenig import uuid4_string
+from homeassistant.components.tankerkoenig import uuid_string
 
 
-class TestUUID4StringValidator(unittest.TestCase):
-    """Test the UUID4 string custom validator."""
+class TestUUIDStringValidator(unittest.TestCase):
+    """Test the UUID string custom validator."""
 
-    def test_uuid4_string(caplog):
+    def test_uuid_string(caplog):
         """Test string uuid validation."""
-        schema = vol.Schema(uuid4_string)
+        schema = vol.Schema(uuid_string)
 
         for value in ["Not a hex string", "0", 0]:
             with pytest.raises(vol.Invalid):
                 schema(value)
 
-        with pytest.raises(vol.Invalid):
-            # the third block should start with 4
-            schema("a03d31b2-2eee-2acc-bb90-eec40be6ed23")
-
-        with pytest.raises(vol.Invalid):
-            # the fourth block should start with 8-a
-            schema("a03d31b2-2eee-4acc-1b90-eec40be6ed23")
-
-        _str = str(uuid.uuid4())
+        _str = str(uuid.uuid())
         assert schema(_str) == _str
         assert schema(_str.upper()) == _str