diff --git a/src/dockerflow/checks/registry.py b/src/dockerflow/checks/registry.py
index 6670104..36b3155 100644
--- a/src/dockerflow/checks/registry.py
+++ b/src/dockerflow/checks/registry.py
@@ -17,19 +17,6 @@
 _REGISTERED_CHECKS = {}
 
 
-def _iscoroutinefunction_or_partial(obj):
-    """
-    Determine if the provided object is a coroutine function or a partial function
-    that wraps a coroutine function.
-
-    This function should be removed when we drop support for Python 3.7, as this is
-    handled directly by `inspect.iscoroutinefunction` in Python 3.8.
-    """
-    while isinstance(obj, functools.partial):
-        obj = obj.func
-    return inspect.iscoroutinefunction(obj)
-
-
 def register(func=None, name=None):
     """
     Register a check callback to be executed from
@@ -43,7 +30,7 @@ def register(func=None, name=None):
 
     logger.debug("Register Dockerflow check %s", name)
 
-    if _iscoroutinefunction_or_partial(func):
+    if inspect.iscoroutinefunction(func):
 
         @functools.wraps(func)
         async def decorated_function_asyc(*args, **kwargs):
@@ -116,7 +103,7 @@ class ChecksResults:
 
 async def _run_check_async(check):
     name, check_fn = check
-    if _iscoroutinefunction_or_partial(check_fn):
+    if inspect.iscoroutinefunction(check_fn):
         errors = await check_fn()
     else:
         loop = asyncio.get_event_loop()
diff --git a/src/dockerflow/fastapi/views.py b/src/dockerflow/fastapi/views.py
index f2dc1cd..96af198 100644
--- a/src/dockerflow/fastapi/views.py
+++ b/src/dockerflow/fastapi/views.py
@@ -11,12 +11,12 @@ def lbheartbeat():
     return {"status": "ok"}
 
 
-def heartbeat(request: Request, response: Response):
+async def heartbeat(request: Request, response: Response):
     FAILED_STATUS_CODE = int(
         getattr(request.app.state, "DOCKERFLOW_HEARTBEAT_FAILED_STATUS_CODE", "500")
     )
 
-    check_results = checks.run_checks(
+    check_results = await checks.run_checks_async(
         checks.get_checks().items(),
     )
 
diff --git a/tests/fastapi/test_fastapi.py b/tests/fastapi/test_fastapi.py
index 4ec97de..73a008c 100644
--- a/tests/fastapi/test_fastapi.py
+++ b/tests/fastapi/test_fastapi.py
@@ -194,6 +194,53 @@ def return_error():
         },
     }
 
+def test_heartbeat_sync(client):
+    @checks.register
+    def sync_ok():
+        return []
+
+    response = client.get("/__heartbeat__")
+    assert response.status_code == 200
+    assert response.json() == {
+        "status": "ok",
+        "checks": {"sync_ok": "ok"},
+        "details": {},
+    }
+
+
+def test_heartbeat_async(client):
+    @checks.register
+    async def async_ok():
+        return []
+
+    response = client.get("/__heartbeat__")
+    assert response.status_code == 200
+    assert response.json() == {
+        "status": "ok",
+        "checks": {"async_ok": "ok"},
+        "details": {},
+    }
+
+
+def test_heartbeat_mixed_sync(client):
+    @checks.register
+    def sync_ok():
+        return []
+    @checks.register
+    async def async_ok():
+        return []
+
+    response = client.get("/__heartbeat__")
+    assert response.status_code == 200
+    assert response.json() == {
+        "status": "ok",
+        "checks": {
+            "sync_ok": "ok",
+            "async_ok": "ok",
+        },
+        "details": {},
+    }
+
 
 def test_heartbeat_head(client):
     @checks.register