diff --git a/addons/web/static/src/views/graph/graph_renderer.js b/addons/web/static/src/views/graph/graph_renderer.js
index 9b480482227..8bf2b352e1c 100644
--- a/addons/web/static/src/views/graph/graph_renderer.js
+++ b/addons/web/static/src/views/graph/graph_renderer.js
@@ -439,7 +439,7 @@ export class GraphRenderer extends Component {
                 suggestedMax: 0,
                 suggestedMin: 0,
             },
-            stacked: mode === "line" && stacked,
+            stacked: mode === "line" && stacked ? stacked : undefined,
         };
         return { xAxes: [xAxe], yAxes: [yAxe] };
     }
diff --git a/addons/web/static/tests/views/graph_view_tests.js b/addons/web/static/tests/views/graph_view_tests.js
index 1b6865c0b40..add22121e76 100644
--- a/addons/web/static/tests/views/graph_view_tests.js
+++ b/addons/web/static/tests/views/graph_view_tests.js
@@ -916,9 +916,9 @@ QUnit.module("Views", (hooks) => {
             "graph should be a classic line chart."
         );
         assert.strictEqual(
-            getScaleY(graph).every((y) => y.stacked),
-            false,
-            "The y axes should have stacked property set to false"
+            getScaleY(graph).every((y) => y.stacked == undefined),
+            true,
+            "The y axes should have stacked property set to undefined"
         );
     });