diff --git a/src/backends/native/meta-kms-update.c b/src/backends/native/meta-kms-update.c
index 9ad87ac2e..39b99585a 100644
--- a/src/backends/native/meta-kms-update.c
+++ b/src/backends/native/meta-kms-update.c
@@ -109,19 +109,19 @@ meta_kms_feedback_free (MetaKmsFeedback *feedback)
 }
 
 MetaKmsFeedbackResult
-meta_kms_feedback_get_result (MetaKmsFeedback *feedback)
+meta_kms_feedback_get_result (const MetaKmsFeedback *feedback)
 {
   return feedback->result;
 }
 
 GList *
-meta_kms_feedback_get_failed_planes (MetaKmsFeedback *feedback)
+meta_kms_feedback_get_failed_planes (const MetaKmsFeedback *feedback)
 {
   return feedback->failed_planes;
 }
 
 const GError *
-meta_kms_feedback_get_error (MetaKmsFeedback *feedback)
+meta_kms_feedback_get_error (const MetaKmsFeedback *feedback)
 {
   return feedback->error;
 }
diff --git a/src/backends/native/meta-kms-update.h b/src/backends/native/meta-kms-update.h
index b5123265e..82a0d96c7 100644
--- a/src/backends/native/meta-kms-update.h
+++ b/src/backends/native/meta-kms-update.h
@@ -71,11 +71,11 @@ typedef struct _MetaKmsPlaneFeedback
 
 void meta_kms_feedback_free (MetaKmsFeedback *feedback);
 
-MetaKmsFeedbackResult meta_kms_feedback_get_result (MetaKmsFeedback *feedback);
+MetaKmsFeedbackResult meta_kms_feedback_get_result (const MetaKmsFeedback *feedback);
 
-GList * meta_kms_feedback_get_failed_planes (MetaKmsFeedback *feedback);
+GList * meta_kms_feedback_get_failed_planes (const MetaKmsFeedback *feedback);
 
-const GError * meta_kms_feedback_get_error (MetaKmsFeedback *feedback);
+const GError * meta_kms_feedback_get_error (const MetaKmsFeedback *feedback);
 
 MetaKmsUpdate * meta_kms_update_new (MetaKmsDevice *device);