diff --git a/.travis.yml b/.travis.yml
index 634262300..07cfdcc3f 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -2,7 +2,7 @@ language: rust
 sudo: 9000
 dist: trusty
 rust:
-  - nightly
+  - nightly-2016-08-23
 os:
   - linux
   - osx
diff --git a/appveyor.yml b/appveyor.yml
index 017a1e174..a62f711ad 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -39,7 +39,7 @@ environment:
 install:
   - ps: Start-FileDownload "http://servo-rust.s3.amazonaws.com/build/MozillaBuildSetup-2.2.0.exe"
   - ps: .\MozillaBuildSetup-2.2.0.exe /S | Out-Null
-  - ps: Start-FileDownload "https://static.rust-lang.org/dist/rust-${env:TARGET}.exe" -FileName "rust-install.exe"
+  - ps: Start-FileDownload "https://static.rust-lang.org/dist/2016-08-23/rust-${env:TARGET}.exe" -FileName "rust-install.exe"
   - ps: .\rust-install.exe /VERYSILENT /NORESTART /DIR="C:\rust" | Out-Null
   - ps: $env:PATH="$env:PATH;C:\rust\bin"
 # I can't make this work with a multi-line script (e.g. via |+ etc.), so we copy the if before every command