diff --git a/src/app/components/table/table.ts b/src/app/components/table/table.ts
index c327ccbd3ee..5d414e5c01d 100644
--- a/src/app/components/table/table.ts
+++ b/src/app/components/table/table.ts
@@ -2424,11 +2424,11 @@ export class Table implements OnInit, AfterViewInit, AfterContentInit, Blockable
     }
 
     toggleRow(rowData: any, event?: Event) {
-        if (!this.dataKey) {
-            throw new Error('dataKey must be defined to use row expansion');
+        if (!this.groupRowsBy) {
+            throw new Error('groupRowsBy must be defined to use row expansion');
         }
 
-        let dataKeyValue = String(ObjectUtils.resolveFieldData(rowData, this.dataKey));
+        let dataKeyValue = String(ObjectUtils.resolveFieldData(rowData, this.groupRowsBy));
 
         if (this.expandedRowKeys[dataKeyValue] != null) {
             delete this.expandedRowKeys[dataKeyValue];
@@ -2458,7 +2458,7 @@ export class Table implements OnInit, AfterViewInit, AfterContentInit, Blockable
     }
 
     isRowExpanded(rowData: any): boolean {
-        return this.expandedRowKeys[String(ObjectUtils.resolveFieldData(rowData, this.dataKey))] === true;
+        return this.expandedRowKeys[String(ObjectUtils.resolveFieldData(rowData, this.groupRowsBy))] === true;
     }
 
     isRowEditing(rowData: any): boolean {