diff --git a/demos/gtk-demo/popover.c b/demos/gtk-demo/popover.c
index 2feb48ac70..3aa201c2d3 100644
--- a/demos/gtk-demo/popover.c
+++ b/demos/gtk-demo/popover.c
@@ -55,10 +55,11 @@ create_complex_popover (GtkWidget       *parent,
 }
 
 static void
-entry_size_allocate_cb (GtkEntry            *entry,
-                        const GtkAllocation *allocation,
-                        int                  baseline,
-                        gpointer             user_data)
+entry_size_allocate_cb (GtkEntry *entry,
+                        int       width,
+                        int       height,
+                        int       baseline,
+                        gpointer  user_data)
 {
   GtkEntryIconPosition popover_pos;
   GtkPopover *popover = user_data;