diff --git a/.appveyor.yml b/.appveyor.yml
index 06068f0dd..872ac6d68 100755
--- a/.appveyor.yml
+++ b/.appveyor.yml
@@ -11,7 +11,7 @@ branches:
 environment:
   QTDIR: 'C:\Qt\5.9\msvc2017_64'
   QMAKESPEC: win32-msvc
-  COMPILERBAT: 'C:\Program Files (x86)\Microsoft Visual Studio\2017\Community\VC\Auxiliary\Build\vcvars64.bat'
+  COMPILERBAT: '"C:\Program Files (x86)\Microsoft Visual Studio\2017\Community\VC\Auxiliary\Build\vcvars64.bat"'
   access_token:
     secure: XCWdr9wPgK4gm6289WXCg2vtMA02eBSnj6eKHC+ps6Z5lgw0jsK09UQ5y9E9ZFwS
   matrix: