diff --git a/src/Db/Adapter/PdoAdapter.php b/src/Db/Adapter/PdoAdapter.php
index eab82677..55570ef8 100644
--- a/src/Db/Adapter/PdoAdapter.php
+++ b/src/Db/Adapter/PdoAdapter.php
@@ -176,6 +176,16 @@ public function getConnection(): Connection
         return $this->connection;
     }
 
+    /**
+     * Backwards compatibility shim for migrations 3.x
+     *
+     * @return \Cake\Database\Connection
+     */
+    public function getDecoratedConnection(): Connection
+    {
+        return $this->getConnection();
+    }
+
     /**
      * @inheritDoc
      */
diff --git a/tests/TestCase/Db/Adapter/SqliteAdapterTest.php b/tests/TestCase/Db/Adapter/SqliteAdapterTest.php
index 593c1d49..36e78af1 100644
--- a/tests/TestCase/Db/Adapter/SqliteAdapterTest.php
+++ b/tests/TestCase/Db/Adapter/SqliteAdapterTest.php
@@ -78,9 +78,11 @@ protected function tearDown(): void
         unset($this->adapter, $this->out, $this->io);
     }
 
-    public function testConnection()
+    public function testGetConnection()
     {
-        $this->assertInstanceOf(Connection::class, $this->adapter->getConnection());
+        $connection = $this->adapter->getConnection();
+        $this->assertInstanceOf(Connection::class, $connection);
+        $this->assertSame($connection, $this->adapter->getDecoratedConnection());
     }
 
     public function testBeginTransaction()