diff --git a/glib/poppler-page.cc b/glib/poppler-page.cc
--- a/glib/poppler-page.cc
+++ b/glib/poppler-page.cc
@@ -86,8 +86,8 @@
 /**
  * poppler_page_get_size:
  * @page: A #PopplerPage
- * @width: (allow-none): return location for the width of @page
- * @height: (allow-none): return location for the height of @page
+ * @width: (out caller-allocates): return location for the width of @page
+ * @height: (out caller-allocates): return location for the height of @page
  * 
  * Gets the size of @page at the current scale and rotation.
  **/