diff --git a/ci/appveyor.ps1 b/ci/appveyor.ps1
index 7c6e0d3..a46bbee 100644
--- a/ci/appveyor.ps1
+++ b/ci/appveyor.ps1
@@ -58,7 +58,7 @@ if ( !(Test-Path "$env:APPVEYOR_BUILD_FOLDER\work\install" ) )
     mkdir $env:APPVEYOR_BUILD_FOLDER\work\git
     
     Start-FileDownload https://github.com/martine/ninja/releases/download/v1.6.0/ninja-win.zip
-    7za e ninja-win.zip -o$INSTALL_DIR
+    7z e ninja-win.zip -o$INSTALL_DIR
     rm  ninja-win.zip
     
     cd $env:APPVEYOR_BUILD_FOLDER\work\git