diff --git a/packages/reflex-hosting-cli/src/reflex_cli/utils/hosting.py b/packages/reflex-hosting-cli/src/reflex_cli/utils/hosting.py
index 010aa1b2823..30a0cd65d75 100644
--- a/packages/reflex-hosting-cli/src/reflex_cli/utils/hosting.py
+++ b/packages/reflex-hosting-cli/src/reflex_cli/utils/hosting.py
@@ -216,16 +216,15 @@ def as_json(self) -> dict[str, Any]:
             dict: The object as a dictionary.
 
         """
-        if self.type is None:
-            self.type = ScaleType.REGION
+        effective_type = self.type or ScaleType.REGION
         return (
             {
-                "type": str(self.type.value),
+                "type": str(effective_type.value),
                 "size": self.vm_type,
             }
-            if self.type == ScaleType.SIZE
+            if effective_type == ScaleType.SIZE
             else {
-                "type": str(self.type.value),
+                "type": str(effective_type.value),
                 "regions": {
                     region["name"]: region["number_of_machines"]
                     for region in self.regions
diff --git a/tests/units/reflex_cli/utils/test_hosting.py b/tests/units/reflex_cli/utils/test_hosting.py
index 312a12e3f09..89d05d96eeb 100644
--- a/tests/units/reflex_cli/utils/test_hosting.py
+++ b/tests/units/reflex_cli/utils/test_hosting.py
@@ -7,6 +7,8 @@
 import pytest
 from pytest_mock import MockerFixture, MockFixture
 from reflex_cli.utils.hosting import (
+    ScaleParams,
+    ScaleType,
     authenticated_token,
     delete_token_from_config,
     get_authenticated_client,
@@ -164,3 +166,14 @@ def test_authenticate_with_env_token_in_non_interactive_mode(mocker: MockerFixtu
 
     assert result == mock_authenticated_client
     mock_get_auth_client.assert_called_once_with(None)
+
+
+def test_scale_params_as_json_is_pure_when_type_is_unspecified():
+    """ScaleParams.as_json should not mutate type when defaulting scale type."""
+    scale_params = ScaleParams(vm_type="shared-1x")
+
+    first = scale_params.as_json()
+    second = scale_params.as_json()
+
+    assert scale_params.type is None
+    assert first == second == {"type": ScaleType.REGION.value, "regions": {}}