diff --git a/src/evidently/ui/dashboards/test_suites.py b/src/evidently/ui/dashboards/test_suites.py
index cea5c97da2..214387cb58 100644
--- a/src/evidently/ui/dashboards/test_suites.py
+++ b/src/evidently/ui/dashboards/test_suites.py
@@ -130,6 +130,7 @@ def _create_aggregate_fig(self, points: TestResultPoints):
             layout={"showlegend": True},
         )
         fig.update_layout(barmode="stack")
+        fig.update_xaxes(type="category")
         return fig
 
     def _create_detailed_fig(self, points: TestResultPoints):