diff --git a/classes/mapworker.php b/classes/mapworker.php
index dda46c8d..d7bf5574 100644
--- a/classes/mapworker.php
+++ b/classes/mapworker.php
@@ -265,6 +265,7 @@ public function process_map_objects(): void {
                 } else {
                     $this->svgmap->set_hidden($links[$place]);
                     $this->svgmap->remove_link($links[$place]);
+                    $this->svgmap->remove_attribute($links[$place], 'data-cmid');
                 }
             }
             // Remove all places that are impossible to reach.
diff --git a/classes/svgmap.php b/classes/svgmap.php
index 6f203b8b..14f97942 100644
--- a/classes/svgmap.php
+++ b/classes/svgmap.php
@@ -535,6 +535,20 @@ public function set_attribute(string $id, string $attribute, string $value): voi
         }
     }
 
+    /**
+     * Removes an attribute of an element.
+     *
+     * @param string $id The id of the DOM element
+     * @param string $attribute The name of the attribute
+     * @return void
+     */
+    public function remove_attribute(string $id, string $attribute): void {
+        $element = $this->get_element_by_id($id);
+        if ($element) {
+            $element->removeAttribute($attribute);
+        }
+    }
+
     /**
      * Replaces all CDATA sections with properly escaped content
      *