diff --git a/lib/picture.c b/lib/picture.c
index 3d5e6280bb..72bc0b578b 100644
--- a/lib/picture.c
+++ b/lib/picture.c
@@ -208,7 +208,7 @@ libvlc_time_t libvlc_picture_get_time( const libvlc_picture_t* pic )
     return pic->time;
 }
 
-libvlc_picture_list_t* libvlc_picture_list_from_attachments( input_attachment_t** attachments,
+libvlc_picture_list_t* libvlc_picture_list_from_attachments( input_attachment_t* const* attachments,
                                                              size_t nb_attachments )
 {
     size_t size = 0;
diff --git a/lib/picture_internal.h b/lib/picture_internal.h
index 9fe79c6def..2cf299fed9 100644
--- a/lib/picture_internal.h
+++ b/lib/picture_internal.h
@@ -44,7 +44,7 @@ libvlc_picture_t* libvlc_picture_new( vlc_object_t* p_obj, picture_t* p_pic,
                                       unsigned int i_width, unsigned int i_height,
                                       bool b_crop );
 
-libvlc_picture_list_t* libvlc_picture_list_from_attachments( input_attachment_t** attachments,
+libvlc_picture_list_t* libvlc_picture_list_from_attachments( input_attachment_t* const* attachments,
                                                              size_t nb_attachments );
 
 #endif /* PICTURE_INTERNAL_H */