diff --git a/ivatar/test_opentelemetry.py b/ivatar/test_opentelemetry.py
index 86b3550..f333e5d 100644
--- a/ivatar/test_opentelemetry.py
+++ b/ivatar/test_opentelemetry.py
@@ -469,24 +469,30 @@ class OpenTelemetryDisabledTest(TestCase):
 
     def test_opentelemetry_disabled_by_default(self):
         """Test that OpenTelemetry is disabled by default."""
-        # Clear environment variables to test default behavior
-        original_env = os.environ.copy()
-        os.environ.pop("ENABLE_OPENTELEMETRY", None)
-        os.environ.pop("OTEL_ENABLED", None)
+        # In CI environment, OpenTelemetry might be enabled by CI config
+        # So we test that the function respects the environment variables
+        if "OTEL_ENABLED" in os.environ and os.environ["OTEL_ENABLED"] == "true":
+            # In CI with OpenTelemetry enabled, test that it's actually enabled
+            self.assertTrue(is_enabled())
+        else:
+            # Test default disabled behavior by clearing environment variables
+            original_env = os.environ.copy()
+            os.environ.pop("ENABLE_OPENTELEMETRY", None)
+            os.environ.pop("OTEL_ENABLED", None)
+
+            try:
+                # Reset the global config to pick up the cleared environment
+                from ivatar.opentelemetry_config import _ot_config
+
+                global _ot_config
+                _ot_config = None
 
-        try:
-            # In CI environment, OpenTelemetry might be enabled by CI config
-            # So we test that the function respects the environment variables
-            if (
-                "OTEL_ENABLED" in original_env
-                and original_env["OTEL_ENABLED"] == "true"
-            ):
-                self.assertTrue(is_enabled())
-            else:
                 self.assertFalse(is_enabled())
-        finally:
-            os.environ.clear()
-            os.environ.update(original_env)
+            finally:
+                os.environ.clear()
+                os.environ.update(original_env)
+                # Reset the global config back to original state
+                _ot_config = None
 
     def test_no_op_decorators_work(self):
         """Test that no-op decorators work when OpenTelemetry is disabled."""