diff -uNr gnuplot-4.0.0.orig/src/gplt_x11.c gnuplot-4.0.0/src/gplt_x11.c
--- gnuplot-4.0.0.orig/src/gplt_x11.c	2004-04-13 19:23:53.000000000 +0200
+++ gnuplot-4.0.0/src/gplt_x11.c	2005-10-15 19:23:38.000000000 +0200
@@ -1104,7 +1104,7 @@
 read_input()
 {
     static int rdbuf_size = 10 * Nbuf;
-    static char rdbuf[10 * Nbuf - 1];
+    static char rdbuf[10 * Nbuf];
     static int total_chars;
     static int rdbuf_offset;
     static int buf_offset;