diff --git a/includes/resourceloader/ResourceLoaderSiteModule.php b/includes/resourceloader/ResourceLoaderSiteModule.php
index 6de242716ee..e04901c3efb 100644
--- a/includes/resourceloader/ResourceLoaderSiteModule.php
+++ b/includes/resourceloader/ResourceLoaderSiteModule.php
@@ -27,6 +27,8 @@
  * @internal
  */
 class ResourceLoaderSiteModule extends ResourceLoaderWikiModule {
+	/** @var string[] What client platforms the module targets (e.g. desktop, mobile) */
+	protected $targets = [ 'desktop', 'mobile' ];
 
 	/**
 	 * Get list of pages used by this module
diff --git a/includes/resourceloader/ResourceLoaderSiteStylesModule.php b/includes/resourceloader/ResourceLoaderSiteStylesModule.php
index fbe055788c1..82ecadd3a75 100644
--- a/includes/resourceloader/ResourceLoaderSiteStylesModule.php
+++ b/includes/resourceloader/ResourceLoaderSiteStylesModule.php
@@ -27,6 +27,8 @@
  * @internal
  */
 class ResourceLoaderSiteStylesModule extends ResourceLoaderWikiModule {
+	/** @var string[] What client platforms the module targets (e.g. desktop, mobile) */
+	protected $targets = [ 'desktop', 'mobile' ];
 
 	/**
 	 * Get list of pages used by this module