Index: resources/data/validator/geometry.mapcss
===================================================================
--- resources/data/validator/geometry.mapcss	(revision 17491)
+++ resources/data/validator/geometry.mapcss	(working copy)
@@ -195,8 +195,8 @@
 }
 
 /* Water area inside water area (spatial test) */
-area:closed:areaStyle[natural =~ /^(water|wetland|coastline)$/] ∈  area:closed:areaStyle.water_area,
-area:closed:areaStyle[landuse=reservoir]                        ∈  area:closed:areaStyle.water_area {
+area:closed:areaStyle[natural =~ /^(water|wetland|coastline)$/] ⊇  area:closed:areaStyle.water_area,
+area:closed:areaStyle[landuse=reservoir]                        ⊇  area:closed:areaStyle.water_area {
   throwWarning: tr("Water area inside water area");
 }