diff --git a/ExternalModule.php b/ExternalModule.php
index 4598262..5a37b97 100644
--- a/ExternalModule.php
+++ b/ExternalModule.php
@@ -28,6 +28,13 @@ function redcap_survey_page_top($project_id, $record = null, $instrument, $event
         $this->applyStyles('survey', $instrument);
     }
 
+    /**
+     * @inheritdoc
+     */
+    function redcap_survey_acknowledgement_page($project_id, $record = null, $instrument, $event_id, $group_id = null, $survey_hash, $response_id = null, $repeat_instance = 1) {
+        $this->applyStyles('survey', $instrument);
+    }
+
     /**
      * Apply CSS rules.
      *
diff --git a/config.json b/config.json
index efba07f..735b2a9 100644
--- a/config.json
+++ b/config.json
@@ -4,7 +4,8 @@
     "description": "Allow administrators to inject CSS into surveys and data entry forms. <strong><a href=\"https://github.com/ctsit/redcap_css_injector\">See full documentation here</a></strong>.",
     "permissions": [
         "redcap_data_entry_form_top",
-        "redcap_survey_page_top"
+        "redcap_survey_page_top",
+        "redcap_survey_acknowledgement_page"
     ],
     "authors": [
         {