diff --git a/src/cairoint.h b/src/cairoint.h
index a1f384c7e..9108d19ee 100644
--- a/src/cairoint.h
+++ b/src/cairoint.h
@@ -1904,7 +1904,7 @@ cairo_private cairo_image_surface_t *
 _cairo_image_surface_clone (cairo_image_surface_t	*surface,
 			    cairo_format_t		 format);
 
-cairo_image_transparency_t
+cairo_private cairo_image_transparency_t
 _cairo_image_analyze_transparency (cairo_image_surface_t      *image);
 
 cairo_private cairo_bool_t