diff --git a/portkey_ai/api_resources/client.py b/portkey_ai/api_resources/client.py
index 4558d2a3..393d008e 100644
--- a/portkey_ai/api_resources/client.py
+++ b/portkey_ai/api_resources/client.py
@@ -275,8 +275,10 @@ def copy(
             provider=provider or self.provider,
             trace_id=trace_id or self.trace_id,
             metadata=metadata or self.metadata,
-            debug=debug or self.debug,
-            cache_force_refresh=cache_force_refresh or self.cache_force_refresh,
+            debug=self.debug if debug is None else debug,
+            cache_force_refresh=self.cache_force_refresh
+            if cache_force_refresh is None
+            else cache_force_refresh,
             custom_host=custom_host or self.custom_host,
             forward_headers=forward_headers or self.forward_headers,
             instrumentation=instrumentation or self.instrumentation,
@@ -621,8 +623,10 @@ def copy(
             provider=provider or self.provider,
             trace_id=trace_id or self.trace_id,
             metadata=metadata or self.metadata,
-            debug=debug or self.debug,
-            cache_force_refresh=cache_force_refresh or self.cache_force_refresh,
+            debug=self.debug if debug is None else debug,
+            cache_force_refresh=self.cache_force_refresh
+            if cache_force_refresh is None
+            else cache_force_refresh,
             custom_host=custom_host or self.custom_host,
             forward_headers=forward_headers or self.forward_headers,
             instrumentation=instrumentation or self.instrumentation,
diff --git a/tests/test_client_copy.py b/tests/test_client_copy.py
new file mode 100644
index 00000000..733bcd80
--- /dev/null
+++ b/tests/test_client_copy.py
@@ -0,0 +1,93 @@
+from typing import List, Optional
+
+import httpx
+import pytest
+
+from portkey_ai import AsyncPortkey, Portkey
+
+
+@pytest.fixture
+def requests() -> List[httpx.Request]:
+    return []
+
+
+@pytest.fixture
+def transport(requests: List[httpx.Request]) -> httpx.MockTransport:
+    def respond(request: httpx.Request) -> httpx.Response:
+        requests.append(request)
+        return httpx.Response(200, json={"id": "test", "choices": []})
+
+    return httpx.MockTransport(respond)
+
+
+@pytest.mark.parametrize("method", ["copy", "with_options"])
+@pytest.mark.parametrize(
+    "initial,override,expected",
+    [
+        (True, False, False),
+        (True, None, True),
+        (False, None, False),
+        (False, True, True),
+    ],
+)
+def test_copy_boolean_headers(
+    method: str,
+    initial: bool,
+    override: Optional[bool],
+    expected: bool,
+    transport: httpx.MockTransport,
+    requests: List[httpx.Request],
+) -> None:
+    with httpx.Client(transport=transport) as http_client:
+        client = Portkey(
+            api_key="test-key",
+            http_client=http_client,
+            debug=initial,
+            cache_force_refresh=initial,
+        )
+        copied = getattr(client, method)(debug=override, cache_force_refresh=override)
+        copied.chat.completions.create(model="test-model", messages=[])
+        client.chat.completions.create(model="test-model", messages=[])
+
+    for header in ("x-portkey-debug", "x-portkey-cache-force-refresh"):
+        assert [request.headers[header] for request in requests] == [
+            str(expected).lower(),
+            str(initial).lower(),
+        ]
+
+
+@pytest.mark.asyncio
+@pytest.mark.parametrize("method", ["copy", "with_options"])
+@pytest.mark.parametrize(
+    "initial,override,expected",
+    [
+        (True, False, False),
+        (True, None, True),
+        (False, None, False),
+        (False, True, True),
+    ],
+)
+async def test_async_copy_boolean_headers(
+    method: str,
+    initial: bool,
+    override: Optional[bool],
+    expected: bool,
+    transport: httpx.MockTransport,
+    requests: List[httpx.Request],
+) -> None:
+    async with httpx.AsyncClient(transport=transport) as http_client:
+        client = AsyncPortkey(
+            api_key="test-key",
+            http_client=http_client,
+            debug=initial,
+            cache_force_refresh=initial,
+        )
+        copied = getattr(client, method)(debug=override, cache_force_refresh=override)
+        await copied.chat.completions.create(model="test-model", messages=[])
+        await client.chat.completions.create(model="test-model", messages=[])
+
+    for header in ("x-portkey-debug", "x-portkey-cache-force-refresh"):
+        assert [request.headers[header] for request in requests] == [
+            str(expected).lower(),
+            str(initial).lower(),
+        ]