diff --git a/lib/fimg-pnm.c b/lib/fimg-pnm.c
index 716623d..c49357e 100644
--- a/lib/fimg-pnm.c
+++ b/lib/fimg-pnm.c
@@ -298,7 +298,7 @@ if (NULL==(fp=fopen(fname, "w"))) {
  *   some software (yes, povray, I look at you) doesn't like
  *   width and height on two separate lines.
  */
-fprintf(fp, "P2\n%d %d\n65532\n\n", src->width, src->height);
+fprintf(fp, "P2\n%d %d\n65535\n\n", src->width, src->height);
 
 area = src->width * src->height;
 maximum = fimg_get_maxvalue(src);