diff --git a/src/app/components/shared/room-join/room-join.component.html b/src/app/components/shared/room-join/room-join.component.html
index eba6c03f211d83f73179a794e1b918315bb241c6..f18b3bb291b72338c3a28b608b6be2094d61df15 100644
--- a/src/app/components/shared/room-join/room-join.component.html
+++ b/src/app/components/shared/room-join/room-join.component.html
@@ -2,7 +2,7 @@
 <form (ngSubmit)="joinRoom(roomId.value)">
   <div fxLayout="row" fxLayoutAlign="center" fxLayoutGap="10px">
     <mat-form-field>
-      <input matInput #roomId type="number" onkeydown="if(this.value.length === 8) return false;" placeholder="Session-Id" [formControl]="roomFormControl"
+      <input matInput #roomId type="number" min="00000000" max="99999999" onkeydown="if(this.value.length === 8 && event.keyCode != 8) return false;" placeholder="Session-Id" [formControl]="roomFormControl"
              [errorStateMatcher]="matcher"/>
       <mat-hint align="end">{{roomId.value.split(' ').join(' ').length}} / 8</mat-hint>
       <mat-error *ngIf="roomFormControl.hasError('required')">{{ 'home-page.please-enter' | translate}}</mat-error>