diff --git a/src/cairo-win32-private.h b/src/cairo-win32-private.h
index 51564d043..40ed20efb 100644
--- a/src/cairo-win32-private.h
+++ b/src/cairo-win32-private.h
@@ -163,6 +163,7 @@ _cairo_win32_surface_create_similar (void	    *abstract_src,
 cairo_status_t
 _cairo_win32_surface_clone_similar (void *abstract_surface,
 				    cairo_surface_t *src,
+				    cairo_content_t content,
 				    int src_x,
 				    int src_y,
 				    int width,