diff --git a/debug/Makefile.am b/debug/Makefile.am
index b393db3e..16433b7b 100644
--- a/debug/Makefile.am
+++ b/debug/Makefile.am
@@ -13,6 +13,7 @@
 ##
 
 noinst_PROGRAMS = \
+	repeat \
 	sync_flush
 
 AM_CPPFLAGS = \
diff --git a/debug/repeat.c b/debug/repeat.c
new file mode 100644
index 00000000..849f7b76
--- /dev/null
+++ b/debug/repeat.c
@@ -0,0 +1,43 @@
+///////////////////////////////////////////////////////////////////////////////
+//
+/// \file       repeat.c
+/// \brief      Repeats given string given times
+///
+/// This program can be useful when debugging run-length encoder in
+/// the Subblock filter, especially the condition when repeat count
+/// doesn't fit into 28-bit integer.
+//
+//  Copyright (C) 2008 Lasse Collin
+//
+//  This library is free software; you can redistribute it and/or
+//  modify it under the terms of the GNU Lesser General Public
+//  License as published by the Free Software Foundation; either
+//  version 2.1 of the License, or (at your option) any later version.
+//
+//  This library is distributed in the hope that it will be useful,
+//  but WITHOUT ANY WARRANTY; without even the implied warranty of
+//  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+//  Lesser General Public License for more details.
+//
+///////////////////////////////////////////////////////////////////////////////
+
+#include "sysdefs.h"
+#include <stdio.h>
+
+
+int
+main(int argc, char **argv)
+{
+	if (argc != 3) {
+		fprintf(stderr, "Usage: %s COUNT STRING\n", argv[0]);
+		exit(1);
+	}
+
+	unsigned long long count = strtoull(argv[1], NULL, 10);
+	const size_t size = strlen(argv[2]);
+
+	while (count-- != 0)
+		fwrite(argv[2], 1, size, stdout);
+
+	return !!(ferror(stdout) || fclose(stdout));
+}