diff --git a/system/Router/AutoRouterImproved.php b/system/Router/AutoRouterImproved.php
index 0db5ebc1ddc2..0b1ba6b642d5 100644
--- a/system/Router/AutoRouterImproved.php
+++ b/system/Router/AutoRouterImproved.php
@@ -519,10 +519,17 @@ private function checkUriForMethod(string $method): void
             return;
         }
 
-        if (! in_array($method, get_class_methods($this->controller), true)) {
-            throw new PageNotFoundException(
-                '"' . $this->controller . '::' . $method . '()" is not found.'
-            );
+        // If `getSomeMethod()` exists, only `controller/some-method` should be
+        // accessible. But if a visitor navigates to `controller/somemethod`,
+        // `getSomemethod()` will be checked, and method_exists() will return true.
+        if (method_exists($this->controller, $method)) {
+            // We do not permit `controller/somemethod`, so check the exact method
+            // name.
+            if (! in_array($method, get_class_methods($this->controller), true)) {
+                throw new PageNotFoundException(
+                    '"' . $this->controller . '::' . $method . '()" is not found.'
+                );
+            }
         }
     }