diff --git a/apps/api/src/app/account/account.controller.ts b/apps/api/src/app/account/account.controller.ts
index 8512d840..1d8f9ab2 100644
--- a/apps/api/src/app/account/account.controller.ts
+++ b/apps/api/src/app/account/account.controller.ts
@@ -87,7 +87,7 @@ export class AccountController {
   @UseInterceptors(RedactValuesInResponseInterceptor)
   @UseInterceptors(TransformDataSourceInRequestInterceptor)
   public async getAllAccounts(
-    @Headers(HEADER_KEY_IMPERSONATION.toLowerCase()) impersonationId,
+    @Headers(HEADER_KEY_IMPERSONATION.toLowerCase()) impersonationId: string,
     @Query('dataSource') filterByDataSource?: string,
     @Query('symbol') filterBySymbol?: string
   ): Promise<AccountsResponse> {
@@ -110,7 +110,7 @@ export class AccountController {
   @UseGuards(AuthGuard('jwt'), HasPermissionGuard)
   @UseInterceptors(RedactValuesInResponseInterceptor)
   public async getAccountById(
-    @Headers(HEADER_KEY_IMPERSONATION.toLowerCase()) impersonationId,
+    @Headers(HEADER_KEY_IMPERSONATION.toLowerCase()) impersonationId: string,
     @Param('id') id: string
   ): Promise<AccountWithValue> {
     const impersonationUserId =
diff --git a/apps/api/src/app/order/order.controller.ts b/apps/api/src/app/order/order.controller.ts
index 907335aa..2c4a5859 100644
--- a/apps/api/src/app/order/order.controller.ts
+++ b/apps/api/src/app/order/order.controller.ts
@@ -97,7 +97,7 @@ export class OrderController {
   @UseInterceptors(TransformDataSourceInRequestInterceptor)
   @UseInterceptors(TransformDataSourceInResponseInterceptor)
   public async getAllOrders(
-    @Headers(HEADER_KEY_IMPERSONATION.toLowerCase()) impersonationId,
+    @Headers(HEADER_KEY_IMPERSONATION.toLowerCase()) impersonationId: string,
     @Query('accounts') filterByAccounts?: string,
     @Query('assetClasses') filterByAssetClasses?: string,
     @Query('dataSource') filterByDataSource?: string,
@@ -150,7 +150,7 @@ export class OrderController {
   @UseInterceptors(RedactValuesInResponseInterceptor)
   @UseInterceptors(TransformDataSourceInResponseInterceptor)
   public async getOrderById(
-    @Headers(HEADER_KEY_IMPERSONATION.toLowerCase()) impersonationId,
+    @Headers(HEADER_KEY_IMPERSONATION.toLowerCase()) impersonationId: string,
     @Param('id') id: string
   ): Promise<Activity> {
     const impersonationUserId =