diff --git a/Cargo.toml b/Cargo.toml
index d0a4b06..9f2d8e5 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -5,7 +5,7 @@ version = "0.0.0"
 
 [dependencies]
 cortex-m = "0.2.2"
-cortex-m-rt = { git = "https://github.com/japaric/cortex-m-rt" }
+cortex-m-rt = { git = "https://github.com/japaric/cortex-m-rt", branch = "next" }
 cortex-m-srp = { git = "https://github.com/japaric/cortex-m-srp", branch = "next" }
 {{name}} = "*"
 
diff --git a/Xargo.toml b/Xargo.toml
new file mode 100644
index 0000000..505d421
--- /dev/null
+++ b/Xargo.toml
@@ -0,0 +1,6 @@
+[dependencies.core]
+
+[dependencies.compiler_builtins]
+features = ["mem"]
+git = "https://github.com/rust-lang-nursery/compiler-builtins"
+stage = 1
\ No newline at end of file