diff --git a/appveyor.yml b/appveyor.yml
index 36dfd50..441992f 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -46,7 +46,7 @@ install:
           "https://github.com/ninja-build/ninja/releases/download/$env:NINJA_TAG/ninja-win.zip"
         $hash = (Get-FileHash ninja-win.zip -Algorithm SHA512).Hash
         if ($env:NINJA_SHA512 -eq $hash) {
-          7z e -y ninja-win.zip -o"$env:NINJA_PATH"
+          7z e -y ninja-win.zip -o"$env:NINJA_PATH" > $NULL
         } else { Write-Warning "Ninja download hash changed!"; Write-Output "$hash" }
       }
       if ([IO.File]::Exists("$env:NINJA_PATH\ninja.exe")) {
@@ -55,7 +55,7 @@ install:
       if ($env:USE_TOOLSET -ne "LLVM") {
         if (![IO.File]::Exists("C:\cmake-3.8.0-win32-x86\bin\cmake.exe")) {
           Start-FileDownload 'https://cmake.org/files/v3.8/cmake-3.8.0-win32-x86.zip'
-          7z x -y cmake-3.8.0-win32-x86.zip -oC:\
+          7z x -y cmake-3.8.0-win32-x86.zip -oC:\ > $NULL
         }
         $env:PATH="C:\cmake-3.8.0-win32-x86\bin;$env:PATH"
       }