diff --git a/core/testcontainers/core/labels.py b/core/testcontainers/core/labels.py
index 474092952..927cdb361 100644
--- a/core/testcontainers/core/labels.py
+++ b/core/testcontainers/core/labels.py
@@ -5,9 +5,9 @@
 from testcontainers.core.config import RYUK_IMAGE
 
 SESSION_ID: str = str(uuid4())
-TEST_CONTAINERS_NAMESPACE = "org.testcontainers"
+TESTCONTAINERS_NAMESPACE = "org.testcontainers"
 
-LABEL_TEST_CONTAINERS = TEST_CONTAINERS_NAMESPACE
+LABEL_TESTCONTAINERS = TESTCONTAINERS_NAMESPACE
 LABEL_SESSION_ID = "org.testcontainers.session-id"
 LABEL_VERSION = "org.testcontainers.version"
 LABEL_LANG = "org.testcontainers.lang"
@@ -18,11 +18,11 @@ def create_labels(image: str, labels: Optional[dict[str, str]]) -> dict[str, str
         labels = {}
     else:
         for k in labels:
-            if k.startswith(TEST_CONTAINERS_NAMESPACE):
+            if k.startswith(TESTCONTAINERS_NAMESPACE):
                 raise ValueError("The org.testcontainers namespace is reserved for interal use")
 
     labels[LABEL_LANG] = "python"
-    labels[LABEL_TEST_CONTAINERS] = "true"
+    labels[LABEL_TESTCONTAINERS] = "true"
     labels[LABEL_VERSION] = importlib.metadata.version("testcontainers")
 
     if image == RYUK_IMAGE:
diff --git a/core/tests/test_labels.py b/core/tests/test_labels.py
index 924e0bdc7..ea1fd4a14 100644
--- a/core/tests/test_labels.py
+++ b/core/tests/test_labels.py
@@ -1,10 +1,10 @@
 from testcontainers.core.labels import (
     LABEL_LANG,
     LABEL_SESSION_ID,
-    LABEL_TEST_CONTAINERS,
+    LABEL_TESTCONTAINERS,
     LABEL_VERSION,
     create_labels,
-    TEST_CONTAINERS_NAMESPACE,
+    TESTCONTAINERS_NAMESPACE,
 )
 import pytest
 from testcontainers.core.config import RYUK_IMAGE
@@ -18,7 +18,7 @@ def assert_in_with_value(labels: dict, label: str, value: str, known_before_test
 
 testdata = [
     (LABEL_LANG, "python", True),
-    (LABEL_TEST_CONTAINERS, "true", True),
+    (LABEL_TESTCONTAINERS, "true", True),
     (LABEL_SESSION_ID, "some", False),
     (LABEL_VERSION, "some", False),
 ]
@@ -33,7 +33,7 @@ def test_containers_creates_expected_labels(label, value, known_before_test_time
 def test_containers_throws_on_namespace_collision():
 
     with pytest.raises(ValueError):
-        create_labels("not-ryuk", {TEST_CONTAINERS_NAMESPACE: "fake"})
+        create_labels("not-ryuk", {TESTCONTAINERS_NAMESPACE: "fake"})
 
 
 def test_containers_respect_custom_labels_if_no_collision():