Index: trunk/src/org/openstreetmap/josm/data/imagery/WMTSTileSource.java
===================================================================
--- trunk/src/org/openstreetmap/josm/data/imagery/WMTSTileSource.java	(revision 13118)
+++ trunk/src/org/openstreetmap/josm/data/imagery/WMTSTileSource.java	(revision 13119)
@@ -56,4 +56,5 @@
 import org.openstreetmap.josm.gui.layer.NativeScaleLayer.ScaleList;
 import org.openstreetmap.josm.io.CachedFile;
+import org.openstreetmap.josm.spi.preferences.Config;
 import org.openstreetmap.josm.tools.CheckParameterUtil;
 import org.openstreetmap.josm.tools.GBC;
@@ -358,5 +359,5 @@
     private Collection<Layer> getCapabilities() throws IOException {
         try (CachedFile cf = new CachedFile(baseUrl); InputStream in = cf.setHttpHeaders(headers).
-                setMaxAge(7 * CachedFile.DAYS).
+                setMaxAge(Config.getPref().getLong("wmts.capabilities.cache.max_age", 7 * CachedFile.DAYS)).
                 setCachingStrategy(CachedFile.CachingStrategy.IfModifiedSince).
                 getInputStream()) {