diff --git a/appveyor.yml b/appveyor.yml
index a0f69a51..716d7706 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -1,2 +1,2 @@
 before_build: cmake .
-build_script: "C:\Program Files\MSBuild\12.0\bin\msbuild.exe"
+build_script: "\"C:\\Program Files\\MSBuild\\12.0\\bin\\msbuild.exe\""