diff --git a/appveyor.yml b/appveyor.yml
index 6442a6c4..2dcacf77 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -32,7 +32,7 @@ install:
            Start-FileDownload  https://github.com/golang/dep/releases/download/v0.4.1/dep-windows-386.exe;
            copy dep-windows-386.exe c:\go\bin\dep.exe;
         }
-  - ps: if($evn:tab_arch -eq 'x64')
+  - ps: if($env:tbs_arch -eq 'x64')
         {
             Start-FileDownload  https://github.com/golang/dep/releases/download/v0.4.1/dep-windows-amd64.exe;
             copy dep-windows-amd64.exe c:\go\bin\dep.exe;