diff --git a/scm-ui/ui-components/src/apiclient.ts b/scm-ui/ui-components/src/apiclient.ts
index 4f2a8a735e..4c1bad8ac1 100644
--- a/scm-ui/ui-components/src/apiclient.ts
+++ b/scm-ui/ui-components/src/apiclient.ts
@@ -80,19 +80,19 @@ class ApiClient {
     return fetch(createUrl(url), applyFetchOptions({})).then(handleFailure);
   }
 
-  post(url: string, payload?: any, contentType = "application/json", additionalHeaders = new Headers()) {
+  post(url: string, payload?: any, contentType = "application/json", additionalHeaders: Record<string, string> = {}) {
     return this.httpRequestWithJSONBody("POST", url, contentType, additionalHeaders, payload);
   }
 
-  postText(url: string, payload: string, additionalHeaders = new Headers()) {
+  postText(url: string, payload: string, additionalHeaders: Record<string, string> = {}) {
     return this.httpRequestWithTextBody("POST", url, additionalHeaders, payload);
   }
 
-  putText(url: string, payload: string, additionalHeaders = new Headers()) {
+  putText(url: string, payload: string, additionalHeaders: Record<string, string> = {}) {
     return this.httpRequestWithTextBody("PUT", url, additionalHeaders, payload);
   }
 
-  postBinary(url: string, fileAppender: (p: FormData) => void, additionalHeaders = new Headers()) {
+  postBinary(url: string, fileAppender: (p: FormData) => void, additionalHeaders: Record<string, string> = {}) {
     const formData = new FormData();
     fileAppender(formData);
 
@@ -104,7 +104,7 @@ class ApiClient {
     return this.httpRequestWithBinaryBody(options, url);
   }
 
-  put(url: string, payload: any, contentType = "application/json", additionalHeaders = new Headers()) {
+  put(url: string, payload: any, contentType = "application/json", additionalHeaders: Record<string, string> = {}) {
     return this.httpRequestWithJSONBody("PUT", url, contentType, additionalHeaders, payload);
   }
 
@@ -128,7 +128,7 @@ class ApiClient {
     method: string,
     url: string,
     contentType: string,
-    additionalHeaders: Headers,
+    additionalHeaders: Record<string, string>,
     payload?: any
   ): Promise<Response> {
     const options: RequestInit = {
@@ -141,7 +141,12 @@ class ApiClient {
     return this.httpRequestWithBinaryBody(options, url, contentType);
   }
 
-  httpRequestWithTextBody(method: string, url: string, additionalHeaders: Headers, payload: string) {
+  httpRequestWithTextBody(
+    method: string,
+    url: string,
+    additionalHeaders: Record<string, string> = {},
+    payload: string
+  ) {
     const options: RequestInit = {
       method: method,
       headers: additionalHeaders
@@ -156,7 +161,7 @@ class ApiClient {
       if (!options.headers) {
         options.headers = new Headers();
       }
-      // @ts-ignore
+      // @ts-ignore We are sure that here we only get headers of type Record<string, string>
       options.headers["Content-Type"] = contentType;
     }