diff --git a/packages/server/src/api/rest/index.ts b/packages/server/src/api/rest/index.ts
index 536a45a5..ed270cb1 100644
--- a/packages/server/src/api/rest/index.ts
+++ b/packages/server/src/api/rest/index.ts
@@ -116,7 +116,7 @@ registerCustomSerializers();
 /**
  * RESTful-style API request handler (compliant with JSON:API)
  */
-export class RestApiHandler<Schema extends SchemaDef> implements ApiHandler<Schema> {
+export class RestApiHandler<Schema extends SchemaDef = SchemaDef> implements ApiHandler<Schema> {
     // resource serializers
     private serializers = new Map<string, Serializer>();
 
diff --git a/packages/server/src/api/rpc/index.ts b/packages/server/src/api/rpc/index.ts
index 586fea33..e4e6ea64 100644
--- a/packages/server/src/api/rpc/index.ts
+++ b/packages/server/src/api/rpc/index.ts
@@ -11,7 +11,7 @@ registerCustomSerializers();
 /**
  * Options for {@link RPCApiHandler}
  */
-export type RPCApiHandlerOptions<Schema extends SchemaDef> = {
+export type RPCApiHandlerOptions<Schema extends SchemaDef = SchemaDef> = {
     /**
      * The schema
      */
@@ -26,7 +26,7 @@ export type RPCApiHandlerOptions<Schema extends SchemaDef> = {
 /**
  * RPC style API request handler that mirrors the ZenStackClient API
  */
-export class RPCApiHandler<Schema extends SchemaDef> implements ApiHandler<Schema> {
+export class RPCApiHandler<Schema extends SchemaDef = SchemaDef> implements ApiHandler<Schema> {
     constructor(private readonly options: RPCApiHandlerOptions<Schema>) {}
 
     get schema(): Schema {
diff --git a/packages/server/src/types.ts b/packages/server/src/types.ts
index 290081f5..0a689a34 100644
--- a/packages/server/src/types.ts
+++ b/packages/server/src/types.ts
@@ -64,7 +64,7 @@ export type Response = {
 /**
  * Framework-agnostic API handler.
  */
-export interface ApiHandler<Schema extends SchemaDef> {
+export interface ApiHandler<Schema extends SchemaDef = SchemaDef> {
     /**
      * The schema associated with this handler.
      */