diff --git a/packages/primevue/src/datatable/style/DataTableStyle.js b/packages/primevue/src/datatable/style/DataTableStyle.js
index 39806ee87..deb48cf18 100644
--- a/packages/primevue/src/datatable/style/DataTableStyle.js
+++ b/packages/primevue/src/datatable/style/DataTableStyle.js
@@ -450,7 +450,7 @@ const theme = ({ dt }) => `
     border-width: 1px 1px 0 1px;
 }
 
-p-datatable-gridlines .p-datatable-tbody > tr:last-child > td {
+.p-datatable-gridlines .p-datatable-tbody > tr:last-child > td {
     border-width: 1px 0 1px 1px;
 }
 
diff --git a/packages/primevue/src/treetable/style/TreeTableStyle.js b/packages/primevue/src/treetable/style/TreeTableStyle.js
index d01358e82..365802ff8 100644
--- a/packages/primevue/src/treetable/style/TreeTableStyle.js
+++ b/packages/primevue/src/treetable/style/TreeTableStyle.js
@@ -300,7 +300,7 @@ const theme = ({ dt }) => `
     border-width: 1px 1px 0 1px;
 }
 
-p-treetable-gridlines .p-treetable-tbody > tr:last-child > td {
+.p-treetable-gridlines .p-treetable-tbody > tr:last-child > td {
     border-width: 1px 0 1px 1px;
 }