diff --git a/debian/patches/0001-cmd_expand-Make-buffer-bigger.patch b/debian/patches/0001-cmd_expand-Make-buffer-bigger.patch
new file mode 100644
index 0000000..56ccf08
--- /dev/null
+++ b/debian/patches/0001-cmd_expand-Make-buffer-bigger.patch
@@ -0,0 +1,21 @@
+From: Willi Mann <willi@debian.org>
+Date: Sat, 31 Dec 2016 14:43:10 +0100
+Subject: cmd_expand: Make buffer bigger
+
+---
+ src/convert.c | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/src/convert.c b/src/convert.c
+index c76d7d6..376be5f 100644
+--- a/src/convert.c
++++ b/src/convert.c
+@@ -1373,7 +1373,7 @@ cmd_ftech (Word *w, int align, char has_param, int param) {
+ 
+ static int 
+ cmd_expand (Word *w, int align, char has_param, int param) {
+-	char str[10];
++	char str[15];
+ 	if (has_param) {
+ 		sprintf(str, "%d", param/4);
+ 		if (!param) 
diff --git a/debian/patches/series b/debian/patches/series
new file mode 100644
index 0000000..f1b9312
--- /dev/null
+++ b/debian/patches/series
@@ -0,0 +1 @@
+0001-cmd_expand-Make-buffer-bigger.patch