diff --git a/zerver/tests/test_decorators.py b/zerver/tests/test_decorators.py
index 9491b9e6d8..17c03ed4c5 100644
--- a/zerver/tests/test_decorators.py
+++ b/zerver/tests/test_decorators.py
@@ -130,7 +130,8 @@ class DecoratorTestCase(ZulipTestCase):
     def test_REQ_aliases(self) -> None:
         @has_request_variables
         def double(
-            request: HttpRequest, x: int = REQ(whence="number", aliases=["x", "n"], converter=int)
+            request: HttpRequest,
+            x: int = REQ(whence="number", aliases=["x", "n"], json_validator=check_int),
         ) -> HttpResponse:
             return json_response(data={"number": x + x})
 
diff --git a/zerver/tornado/views.py b/zerver/tornado/views.py
index c800090bb4..a17793fbf4 100644
--- a/zerver/tornado/views.py
+++ b/zerver/tornado/views.py
@@ -67,7 +67,7 @@ def get_events_backend(
     user_client: Optional[Client] = REQ(
         converter=get_client, default=None, intentionally_undocumented=True
     ),
-    last_event_id: Optional[int] = REQ(converter=int, default=None),
+    last_event_id: Optional[int] = REQ(json_validator=check_int, default=None),
     queue_id: Optional[str] = REQ(default=None),
     # apply_markdown, client_gravatar, all_public_streams, and various
     # other parameters are only used when registering a new queue via this
diff --git a/zerver/views/events_register.py b/zerver/views/events_register.py
index 1851ae4b2b..175f971841 100644
--- a/zerver/views/events_register.py
+++ b/zerver/views/events_register.py
@@ -7,7 +7,7 @@ from zerver.lib.events import do_events_register
 from zerver.lib.exceptions import JsonableError
 from zerver.lib.request import REQ, RequestNotes, has_request_variables
 from zerver.lib.response import json_success
-from zerver.lib.validator import check_bool, check_dict, check_list, check_string
+from zerver.lib.validator import check_bool, check_dict, check_int, check_list, check_string
 from zerver.models import Stream, UserProfile
 
 
@@ -69,7 +69,7 @@ def events_register_backend(
     narrow: NarrowT = REQ(
         json_validator=check_list(check_list(check_string, length=2)), default=[]
     ),
-    queue_lifespan_secs: int = REQ(converter=int, default=0, documentation_pending=True),
+    queue_lifespan_secs: int = REQ(json_validator=check_int, default=0, documentation_pending=True),
 ) -> HttpResponse:
     if all_public_streams and not user_profile.can_access_public_streams():
         raise JsonableError(_("User not authorized for this query"))