diff --git a/sys/xvimage/xvimageallocator.c b/sys/xvimage/xvimageallocator.c
index c5be6db1d2..47c7da0073 100644
--- a/sys/xvimage/xvimageallocator.c
+++ b/sys/xvimage/xvimageallocator.c
@@ -343,7 +343,7 @@ gst_xvimage_allocator_peek_context (GstXvImageAllocator * allocator)
 GstMemory *
 gst_xvimage_allocator_alloc (GstXvImageAllocator * allocator, gint im_format,
     const GstVideoInfo * info, gint padded_width, gint padded_height,
-    GstVideoRectangle * crop, GError ** error)
+    const GstVideoRectangle * crop, GError ** error)
 {
   int (*handler) (Display *, XErrorEvent *);
   gboolean success = FALSE;
diff --git a/sys/xvimage/xvimageallocator.h b/sys/xvimage/xvimageallocator.h
index b47539dff5..f9b7ee396a 100644
--- a/sys/xvimage/xvimageallocator.h
+++ b/sys/xvimage/xvimageallocator.h
@@ -47,7 +47,7 @@ GstMemory *           gst_xvimage_allocator_alloc       (GstXvImageAllocator * a
                                                          const GstVideoInfo * info,
                                                          gint padded_width,
                                                          gint padded_height,
-                                                         GstVideoRectangle *crop,
+                                                         const GstVideoRectangle *crop,
                                                          GError ** error);
 
 /* memory from the allocator */