diff --git a/projects/ng-table-virtual-scroll/src/lib/fixed-size-table-virtual-scroll-strategy.ts b/projects/ng-table-virtual-scroll/src/lib/fixed-size-table-virtual-scroll-strategy.ts
index 0fffd23..8c997b8 100644
--- a/projects/ng-table-virtual-scroll/src/lib/fixed-size-table-virtual-scroll-strategy.ts
+++ b/projects/ng-table-virtual-scroll/src/lib/fixed-size-table-virtual-scroll-strategy.ts
@@ -31,8 +31,10 @@ export class FixedSizeTableVirtualScrollStrategy implements VirtualScrollStrateg
   }
 
   set dataLength(value: number) {
-    this._dataLength = value;
-    this.onDataLengthChanged();
+    if (value !== this._dataLength) {
+      this._dataLength = value;
+      this.onDataLengthChanged();
+    }
   }
 
   private _dataLength = 0;