diff --git a/lib/process-services/src/lib/form/widgets/dropdown/dropdown.widget.ts b/lib/process-services/src/lib/form/widgets/dropdown/dropdown.widget.ts
index bda8fc7416..717028268f 100644
--- a/lib/process-services/src/lib/form/widgets/dropdown/dropdown.widget.ts
+++ b/lib/process-services/src/lib/form/widgets/dropdown/dropdown.widget.ts
@@ -25,7 +25,8 @@ import { CommonModule } from '@angular/common';
 import { MatFormFieldModule } from '@angular/material/form-field';
 import { MatSelectModule } from '@angular/material/select';
 import { AbstractControl, FormControl, ReactiveFormsModule, ValidationErrors, ValidatorFn } from '@angular/forms';
-import { filter, Subject, takeUntil } from 'rxjs';
+import { filter, takeUntil } from 'rxjs/operators';
+import { Subject } from 'rxjs';
 import { TranslateModule } from '@ngx-translate/core';
 
 @Component({