diff --git a/tests/testdata/control_images/qgis_server/WMS_GetMap_Highlight_Empty_Labels/WMS_GetMap_Highlight_Empty_Labels_mask.png b/tests/testdata/control_images/qgis_server/WMS_GetMap_Highlight_Empty_Labels/WMS_GetMap_Highlight_Empty_Labels_mask.png
index 61e2c19e1446..d2528c6f0e3d 100644
Binary files a/tests/testdata/control_images/qgis_server/WMS_GetMap_Highlight_Empty_Labels/WMS_GetMap_Highlight_Empty_Labels_mask.png and b/tests/testdata/control_images/qgis_server/WMS_GetMap_Highlight_Empty_Labels/WMS_GetMap_Highlight_Empty_Labels_mask.png differ