diff --git a/projects/addon-charts/components/pie-chart/pie-chart.directive.ts b/projects/addon-charts/components/pie-chart/pie-chart.directive.ts
index 6b4427d3176c..d16f3c643c68 100644
--- a/projects/addon-charts/components/pie-chart/pie-chart.directive.ts
+++ b/projects/addon-charts/components/pie-chart/pie-chart.directive.ts
@@ -16,41 +16,41 @@ import {BehaviorSubject, map, pairwise, switchMap, takeWhile} from 'rxjs';
 })
 export class TuiPieChartDirective {
     private readonly sector$ = new BehaviorSubject<readonly [number, number]>([0, 0]);
+    private readonly el = tuiInjectElement<SVGPathElement>();
+    private readonly performance = inject(WA_PERFORMANCE);
+    private readonly animationFrame$ = inject(WA_ANIMATION_FRAME);
+    private readonly speed = inject(TUI_ANIMATIONS_SPEED);
+    protected readonly $ = this.sector$
+        .pipe(
+            pairwise(),
+            switchMap(([prev, cur]) => {
+                const now = this.performance.now();
+                const startDelta = cur[0] - prev[0];
+                const endDelta = cur[1] - prev[1];
 
-    constructor() {
-        const el = tuiInjectElement<SVGPathElement>();
-        const performance = inject(WA_PERFORMANCE);
-        const animationFrame$ = inject(WA_ANIMATION_FRAME);
-        const speed = inject(TUI_ANIMATIONS_SPEED);
-
-        this.sector$
-            .pipe(
-                pairwise(),
-                switchMap(([prev, cur]) => {
-                    const now = performance.now();
-                    const startDelta = cur[0] - prev[0];
-                    const endDelta = cur[1] - prev[1];
-
-                    return animationFrame$.pipe(
-                        map((timestamp) =>
-                            tuiEaseInOutQuad(
-                                tuiClamp((timestamp - now) / tuiGetDuration(speed), 0, 1),
+                return this.animationFrame$.pipe(
+                    map((timestamp) =>
+                        tuiEaseInOutQuad(
+                            tuiClamp(
+                                (timestamp - now) / tuiGetDuration(this.speed),
+                                0,
+                                1,
                             ),
                         ),
-                        takeWhile((progress) => progress < 1, true),
-                        map((progress) => [
-                            prev[0] + startDelta * progress,
-                            cur[1] > 359 ? cur[1] : prev[1] + endDelta * progress,
-                        ]),
-                    );
-                }),
-                tuiZonefree(),
-                takeUntilDestroyed(),
-            )
-            .subscribe(([start, end]) =>
-                el.setAttribute('d', tuiDescribeSector(start, end)),
-            );
-    }
+                    ),
+                    takeWhile((progress) => progress < 1, true),
+                    map((progress) => [
+                        prev[0] + startDelta * progress,
+                        cur[1] > 359 ? cur[1] : prev[1] + endDelta * progress,
+                    ]),
+                );
+            }),
+            tuiZonefree(),
+            takeUntilDestroyed(),
+        )
+        .subscribe(([start, end]) =>
+            this.el.setAttribute('d', tuiDescribeSector(start, end)),
+        );
 
     @Input()
     public set tuiPieChart(sector: readonly [number, number]) {