diff --git a/Cargo.lock b/Cargo.lock
index 1daa4d783f1..5e41ebd272a 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -151,8 +151,7 @@ dependencies = [
 [[package]]
 name = "autocfg"
 version = "0.1.6"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b671c8fb71b457dd4ae18c4ba1e59aa81793daacc361d82fcd410cef0d491875"
+source = "git+https://github.com/servo/autocfg?branch=rustflags#d040e25ff6c129189306011f6a0ff210e08227a0"
 
 [[package]]
 name = "azure"
diff --git a/Cargo.toml b/Cargo.toml
index fd99b5fc2fe..2bfc0013f4d 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -29,3 +29,5 @@ opt-level = 3
 mio = { git = "https://github.com/servo/mio.git", branch = "servo" }
 rand_os = { git = "https://github.com/servo/rand", branch = "servo-rand_os-0.1.3-uwp" }
 rand_core = { git = "https://github.com/servo/rand", branch = "servo-rand_os-0.1.3-uwp" }
+# https://github.com/cuviper/autocfg/pull/10
+autocfg = { git = "https://github.com/servo/autocfg", branch = "rustflags" }