diff --git a/src/app/components/dropdown/dropdown.ts b/src/app/components/dropdown/dropdown.ts
index 4272b70091d..5a7b234cd64 100755
--- a/src/app/components/dropdown/dropdown.ts
+++ b/src/app/components/dropdown/dropdown.ts
@@ -266,13 +266,13 @@ export class DropdownItem {
                             <ng-template #buildInItems let-items let-scrollerOptions="options">
                                 <ul #items [attr.id]="id + '_list'" class="p-dropdown-items" [ngClass]="scrollerOptions.contentStyleClass" [style]="scrollerOptions.contentStyle" role="listbox">
                                     <ng-template ngFor let-option [ngForOf]="items" let-i="index">
-                                        <ng-container *ngIf="option.group">
+                                        <ng-container *ngIf="isOptionGroup(option)">
                                             <li class="p-dropdown-item-group" [attr.id]="id + '_' + getOptionIndex(i, scrollerOptions)" [ngStyle]="{ height: scrollerOptions.itemSize + 'px' }" role="option">
                                                 <span *ngIf="!groupTemplate">{{ getOptionGroupLabel(option.optionGroup) }}</span>
                                                 <ng-container *ngTemplateOutlet="groupTemplate; context: { $implicit: option.optionGroup }"></ng-container>
                                             </li>
                                         </ng-container>
-                                        <ng-container *ngIf="!option.group">
+                                        <ng-container *ngIf="!isOptionGroup(option)">
                                             <p-dropdownItem
                                                 [id]="id + '_' + getOptionIndex(i, scrollerOptions)"
                                                 [option]="option"