diff --git a/src/cairo-pdf.h b/src/cairo-pdf.h
index 53699d418..52a897404 100644
--- a/src/cairo-pdf.h
+++ b/src/cairo-pdf.h
@@ -54,7 +54,7 @@ cairo_pdf_surface_create_for_stream (cairo_write_func_t	write_func,
 				     double		width_in_points,
 				     double		height_in_points);
 
-void
+cairo_public void
 cairo_pdf_surface_set_size (cairo_surface_t	*surface,
 			    double		 width_in_points,
 			    double		 height_in_points);