diff --git a/codegen/Cargo.toml b/codegen/Cargo.toml
index 3d3c391..ed5029b 100644
--- a/codegen/Cargo.toml
+++ b/codegen/Cargo.toml
@@ -11,4 +11,4 @@
 failure = "0.1"
 inflections = "1.1"
 proc-macro2 = "0.4"
-rustfmt-nightly = "0.99"
+rustfmt-nightly = { git = "https://github.com/rust-lang-nursery/rustfmt" }