diff --git a/appveyor.yml b/appveyor.yml
index d9b6472d6..f95671e9a 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -9,11 +9,13 @@ environment:
       target: x86_64-pc-windows-msvc
     - channel: nightly
       target: x86_64-pc-windows-gnu
+      msys_bits: 64
 
 install:
   - appveyor DownloadFile https://win.rustup.rs/ -FileName rustup-init.exe
   - rustup-init -yv --default-toolchain %channel% --default-host %target%
   - set PATH=%PATH%;%USERPROFILE%\.cargo\bin
+  - if defined msys_bits set PATH=%PATH%;C:\msys64\mingw%msys_bits%\bin
   - rustc -vV
   - cargo -vV