diff --git a/grace/src/rstdrv.c b/grace/src/rstdrv.c

index 7a92692..cc00fe0 100644

--- a/grace/src/rstdrv.c

+++ b/grace/src/rstdrv.c

@@ -35,6 +35,7 @@

 #include <stdio.h>

 #include <stdlib.h>

+#include <zlib.h>

 #include "defines.h"

 #include "utils.h"

@@ -885,7 +886,7 @@ static void rstImagePng(gdImagePtr ihandle, FILE *prstream)

         return;

     }

-    if (setjmp(png_ptr->jmpbuf)) {

+    if (setjmp(png_jmpbuf(png_ptr))) {

         png_destroy_write_struct(&png_ptr, &info_ptr);

         return;

     }