diff --git a/appveyor.yml b/appveyor.yml
index dd539b3..9783b66 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -10,7 +10,7 @@ environment:
 install:
   - ps: Start-FileDownload "http://slproweb.com/download/Win${env:BITS}OpenSSL-1_0_2g.exe"
   - Win%BITS%OpenSSL-1_0_2g.exe /SILENT /VERYSILENT /SP- /DIR="C:\OpenSSL"
-  - ps: Start-FileDownload 'https://static.rust-lang.org/dist/rust-nightly-${env:TARGET}.exe'
+  - ps: Start-FileDownload "https://static.rust-lang.org/dist/rust-nightly-${env:TARGET}.exe"
   - rust-nightly-%TARGET%.exe /VERYSILENT /NORESTART /DIR="C:\Program Files (x86)\Rust"
   - SET PATH=%PATH%;C:\Program Files (x86)\Rust\bin
   - SET PATH=%PATH%;C:\MinGW\bin