diff --git a/libs/opmapcontrol/src/internals/core.cpp b/libs/opmapcontrol/src/internals/core.cpp
index 46e8f7ae834d29cdfe5ec2a3229c537174d62ae9..10459eb1e33414a929af271fb46c64345e1f2761 100644
--- a/libs/opmapcontrol/src/internals/core.cpp
+++ b/libs/opmapcontrol/src/internals/core.cpp
@@ -375,7 +375,7 @@ namespace internals {
                     {
                         SetProjection(new MercatorProjection());
                     }
-                    maxzoom=21;
+                    maxzoom=20;
                 }
                 break;
             }