diff --git a/backend_dnpds40.c b/backend_dnpds40.c
index 0c19c4b..500de90 100644
--- a/backend_dnpds40.c
+++ b/backend_dnpds40.c
@@ -323,7 +323,7 @@ static void dnpds40_teardown(void *vctx) {
 	free(ctx);
 }
 
-#define MAX_PRINTJOB_LEN (27927714+1024) // Add a little bit of padding
+#define MAX_PRINTJOB_LEN (((2448*7536+1024+54))*3+1024) /* Worst-case */
 
 static int dnpds40_read_parse(void *vctx, int data_fd) {
 	struct dnpds40_ctx *ctx = vctx;
@@ -902,7 +902,7 @@ static int dnpds40_cmdline_arg(void *vctx, int run, char *arg1, char *arg2)
 /* Exported */
 struct dyesub_backend dnpds40_backend = {
 	.name = "DNP DS40/DS80",
-	.version = "0.18",
+	.version = "0.19",
 	.uri_prefix = "dnpds40",
 	.cmdline_usage = dnpds40_cmdline,
 	.cmdline_arg = dnpds40_cmdline_arg,