diff --git a/src/abstractions/api.service.ts b/src/abstractions/api.service.ts
index 9829f5abc2a..6059f3a4a56 100644
--- a/src/abstractions/api.service.ts
+++ b/src/abstractions/api.service.ts
@@ -18,7 +18,7 @@ export interface ApiService {
     identityBaseUrl: string;
     deviceType: string;
     logoutCallback: Function;
-    setUrls(urls: EnvironmentUrls);
+    setUrls(urls: EnvironmentUrls): void;
     postIdentityToken(request: TokenRequest): Promise<IdentityTokenResponse | any>;
     refreshIdentityToken(): Promise<any>;
     postTwoFactorEmail(request: TwoFactorEmailRequest): Promise<any>;
diff --git a/src/services/api.service.ts b/src/services/api.service.ts
index 5e41da5236e..e9838ed0950 100644
--- a/src/services/api.service.ts
+++ b/src/services/api.service.ts
@@ -32,7 +32,7 @@ export class ApiService implements ApiServiceInterface {
         this.deviceType = platformUtilsService.getDevice().toString();
     }
 
-    setUrls(urls: EnvironmentUrls) {
+    setUrls(urls: EnvironmentUrls): void {
         this.urlsSet = true;
 
         if (urls.base != null) {