diff --git a/.changeset/yellow-knives-behave.md b/.changeset/yellow-knives-behave.md
new file mode 100644
index 000000000..59b3f1109
--- /dev/null
+++ b/.changeset/yellow-knives-behave.md
@@ -0,0 +1,6 @@
+---
+'@powersync/service-core': patch
+'@powersync/service-image': patch
+---
+
+Protocol: Allow `null` as stream parameter.
diff --git a/packages/service-core/src/util/protocol-types.ts b/packages/service-core/src/util/protocol-types.ts
index 21e5716c2..4a6410b4c 100644
--- a/packages/service-core/src/util/protocol-types.ts
+++ b/packages/service-core/src/util/protocol-types.ts
@@ -1,5 +1,5 @@
 import * as t from 'ts-codec';
-import { BucketDescription, BucketPriority, SqliteJsonRow } from '@powersync/service-sync-rules';
+import { BucketPriority, SqliteJsonRow } from '@powersync/service-sync-rules';
 import { JsonContainer } from '@powersync/service-jsonbig';
 
 export const BucketRequest = t.object({
@@ -24,7 +24,7 @@ export const RequestedStreamSubscription = t.object({
   /**
    * An optional dictionary of parameters to pass to this specific stream.
    */
-  parameters: t.record(t.any).optional(),
+  parameters: t.union(t.record(t.any), t.Null),
   /**
    * Set when the client wishes to re-assign a different priority to this stream.
    *
diff --git a/packages/service-core/test/src/util/protocol_types.test.ts b/packages/service-core/test/src/util/protocol_types.test.ts
new file mode 100644
index 000000000..a86013e7c
--- /dev/null
+++ b/packages/service-core/test/src/util/protocol_types.test.ts
@@ -0,0 +1,43 @@
+import { StreamingSyncRequest } from '@/index.js';
+import { schema } from '@powersync/lib-services-framework';
+import { describe, test, expect, it } from 'vitest';
+
+describe('protocol types', () => {
+  describe('StreamingSyncRequest', () => {
+    const validator = schema.createTsCodecValidator(StreamingSyncRequest, { allowAdditional: true });
+
+    test('with streams', () => {
+      expect(
+        validator.validate({
+          buckets: [],
+          include_checksum: true,
+          raw_data: true,
+          binary_data: true,
+          client_id: '0da33a94-c140-4b42-b3b3-a1df3b1352a3',
+          parameters: {},
+          streams: {
+            include_defaults: true,
+            subscriptions: [{ stream: 'does_not_exist', parameters: null, override_priority: null }]
+          }
+        } as any)
+      ).toMatchObject({ valid: true });
+    });
+
+    test('does not allow missing parameters', () => {
+      expect(
+        validator.validate({
+          buckets: [],
+          include_checksum: true,
+          raw_data: true,
+          binary_data: true,
+          client_id: '0da33a94-c140-4b42-b3b3-a1df3b1352a3',
+          parameters: {},
+          streams: {
+            include_defaults: true,
+            subscriptions: [{ stream: 'a', override_priority: null }]
+          }
+        } as any)
+      ).toMatchObject({ valid: false });
+    });
+  });
+});
diff --git a/packages/sync-rules/src/streams/stream.ts b/packages/sync-rules/src/streams/stream.ts
index 612175574..0197b83d2 100644
--- a/packages/sync-rules/src/streams/stream.ts
+++ b/packages/sync-rules/src/streams/stream.ts
@@ -3,7 +3,6 @@ import { BucketInclusionReason, BucketPriority, DEFAULT_BUCKET_PRIORITY } from '
 import { BucketParameterQuerier, PendingQueriers } from '../BucketParameterQuerier.js';
 import { BucketSource, BucketSourceType, ResultSetDescription } from '../BucketSource.js';
 import { ColumnDefinition } from '../ExpressionType.js';
-import { CompatibilityContext } from '../compatibility.js';
 import { SourceTableInterface } from '../SourceTableInterface.js';
 import { GetQuerierOptions, RequestedStream } from '../SqlSyncRules.js';
 import { TablePattern } from '../TablePattern.js';
@@ -17,7 +16,6 @@ import {
   SqliteRow,
   TableRow
 } from '../types.js';
-import { applyRowContext } from '../utils.js';
 import { StreamVariant } from './variant.js';
 
 export class SyncStream implements BucketSource {