From 8869741166584a533330e6bfbb43d39bbbef731b Mon Sep 17 00:00:00 2001
From: Gav <gavin@parity.io>
Date: Mon, 15 Jan 2018 12:01:05 +0100
Subject: [PATCH] Minor fix.

---
 substrate/wasm-runtime/polkadot/src/lib.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/substrate/wasm-runtime/polkadot/src/lib.rs b/substrate/wasm-runtime/polkadot/src/lib.rs
index fa22929a79..02c35675e3 100644
--- a/substrate/wasm-runtime/polkadot/src/lib.rs
+++ b/substrate/wasm-runtime/polkadot/src/lib.rs
@@ -75,7 +75,7 @@ impl<'a> StreamWriter<'a> {
 		value.as_slice_then(|s| {
 			let new_offset = self.offset + s.len();
 			if self.data.len() <= new_offset {
-				let slice = &self.data[self.offset..new_offset];
+				let slice = &mut self.data[self.offset..new_offset];
 				self.offset = new_offset;
 				slice.copy_from_slice(s);
 				true