diff --git a/configure.php b/configure.php
index c573fbf..d169abf 100644
--- a/configure.php
+++ b/configure.php
@@ -643,6 +643,13 @@ function install_plugin( array $plugin_data, bool $prompt, &$installed_plugins )
 		],
 	);
 
+	replace_in_file(
+		'phpstan.neon',
+		[
+			'mu-plugins/' => 'client-mu-plugins/',
+		],
+	);
+
 	// Remove the pantheon mu-plugin from the plugin loader file.
 	replace_in_file(
 		'client-mu-plugins/plugin-loader.php',