diff --git a/src/libsysprof-gtk/tests/test-charts.ui b/src/libsysprof-gtk/tests/test-charts.ui
index a9427259..231cbbf3 100644
--- a/src/libsysprof-gtk/tests/test-charts.ui
+++ b/src/libsysprof-gtk/tests/test-charts.ui
@@ -110,6 +110,8 @@
             <child>
               <object class="SysprofLineLayer">
                 <property name="spline">true</property>
+                <property name="dashed">true</property>
+                <property name="fill">true</property>
                 <binding name="x-axis">
                   <lookup name="selected-time-axis" type="SysprofSession">
                     <lookup name="session" type="SysprofSessionModelItem">