diff --git a/appveyor.yml b/appveyor.yml
index 78420e23192..9ccc615c0c5 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -3,13 +3,13 @@ environment:
         PROJECT_NAME: rust-clippy
     matrix:
         - TARGET: i686-pc-windows-gnu
-          MSYS2_BITS=32
+          MSYS2_BITS: 32
         - TARGET: i686-pc-windows-msvc
-          MSYS2_BITS=32
+          MSYS2_BITS: 32
         - TARGET: x86_64-pc-windows-gnu
-          MSYS2_BITS=64
+          MSYS2_BITS: 64
         - TARGET: x86_64-pc-windows-msvc
-          MSYS2_BITS=64
+          MSYS2_BITS: 64
 
 install:
     - curl -sSf -o rustup-init.exe https://win.rustup.rs/