diff --git a/frontend/src/app/modules/members/members-autocompleter.component.ts b/frontend/src/app/modules/members/members-autocompleter.component.ts
index 3a90ec92ea..0773d3ba56 100644
--- a/frontend/src/app/modules/members/members-autocompleter.component.ts
+++ b/frontend/src/app/modules/members/members-autocompleter.component.ts
@@ -2,8 +2,9 @@ import {UserAutocompleterComponent} from "core-app/modules/common/autocomplete/u
 import {Observable} from "rxjs";
 import {map} from "rxjs/operators";
 import {InjectField} from "core-app/helpers/angular/inject-field.decorator";
-import {HttpClient} from "@angular/common/http";
+import {HttpClient, HttpParams} from "@angular/common/http";
 import {Component} from "@angular/core";
+import {URLParamsEncoder} from "core-app/modules/hal/services/url-params-encoder";
 
 export const membersAutocompleterSelector = 'members-autocompleter';
 
@@ -14,13 +15,15 @@ export const membersAutocompleterSelector = 'members-autocompleter';
 export class MembersAutocompleterComponent extends UserAutocompleterComponent {
   @InjectField() http:HttpClient;
 
-  protected getAvailableUsers(url:string, searchTerm:any):Observable<{[key:string]:string|null}[]> {
+  protected getAvailableUsers(url:string, searchTerm:any):Observable<{ [key:string]:string|null }[]> {
     return this.http
       .get(url,
-        { params: { q: searchTerm },
+        {
+          params: new HttpParams({ encoder: new URLParamsEncoder(), fromObject: { q: searchTerm } }),
           responseType: 'json',
-          headers: { 'Content-Type': 'application/json; charset=utf-8' }},
-        )
+          headers: { 'Content-Type': 'application/json; charset=utf-8' }
+        },
+      )
       .pipe(
         map((res:any) => {
           return res.results.items.map((el:any) => {