Index: /trunk/data/validator/geometry.mapcss
===================================================================
--- /trunk/data/validator/geometry.mapcss	(revision 11743)
+++ /trunk/data/validator/geometry.mapcss	(revision 11744)
@@ -290,7 +290,7 @@
 }
 
-/* #10717 */
-way[natural=coastline] ∈ area[natural=water],
-way[natural=coastline] ∈ area[waterway=riverbank] {
+/* #10717, #14535 */
+way:closed[natural=coastline] ∈ area[natural=water],
+way:closed[natural=coastline] ∈ area[waterway=riverbank] {
   throwError: tr("Coastline inside {1}", "{0.tag}");
 }