diff --git a/src/sentry/api/fields/empty_decimal.py b/src/sentry/api/fields/empty_decimal.py
index 35c7ab2344d3..955f71f38fb2 100644
--- a/src/sentry/api/fields/empty_decimal.py
+++ b/src/sentry/api/fields/empty_decimal.py
@@ -1,5 +1,4 @@
 from decimal import Decimal
-from typing import cast
 
 from rest_framework import serializers
 from rest_framework.fields import empty
@@ -12,11 +11,6 @@ class EmptyDecimalField(serializers.DecimalField):
     cases, so this restores it.
     """
 
-    def to_internal_value(self, data: int | float | str | Decimal) -> Decimal:
-        if data == "":
-            return cast(Decimal, None)
-        return super().to_internal_value(data)
-
     def run_validation(self, data: object = empty) -> Decimal | None:
         if data == "":
             return None
diff --git a/src/sentry/api/fields/empty_integer.py b/src/sentry/api/fields/empty_integer.py
index 63cdcb85424e..f798ce9cd7ba 100644
--- a/src/sentry/api/fields/empty_integer.py
+++ b/src/sentry/api/fields/empty_integer.py
@@ -1,5 +1,3 @@
-from typing import cast
-
 from rest_framework import serializers
 from rest_framework.fields import empty
 
@@ -11,11 +9,6 @@ class EmptyIntegerField(serializers.IntegerField):
     cases, so this restores it.
     """
 
-    def to_internal_value(self, data: int | float | str) -> int:
-        if data == "":
-            return cast(int, None)
-        return super().to_internal_value(data)
-
     def run_validation(self, data: object = empty) -> int | None:
         if data == "":
             return None
diff --git a/src/sentry/monitors/validators.py b/src/sentry/monitors/validators.py
index 930ea9265100..d16ea61bba99 100644
--- a/src/sentry/monitors/validators.py
+++ b/src/sentry/monitors/validators.py
@@ -131,8 +131,8 @@ def get_value(self, dictionary: Any) -> Any:
 
 
 class MissedMarginField(EmptyIntegerField):
-    def to_internal_value(self, value: Any) -> Any:
-        value = super().to_internal_value(value)
+    def to_internal_value(self, data: float | int | str) -> int:
+        value = super().to_internal_value(data)
 
         # XXX(epurkhiser): As part of GH-56526 we changed the minimum value
         # allowed for the checkin_margin to 1 from 0. Some monitors may still