diff --git a/appveyor.yml b/appveyor.yml
index 2c1f8fe0..0d602fe3 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -36,9 +36,9 @@ before_build:
   - cd build
   - ps: |
       if ($env:PLATFORM -eq 'Win32') {
-        cmake .. -G "Visual Studio 14 2015" -DBOOST_ROOT="C:\projects\boost_1_61_0" -DBOOST_LIBRARYDIR="C:\projects\boost_1_61_0\stage\32\lib"
+        cmake .. -G "Visual Studio 14 2015" -DBOOST_ROOT="C:/projects/boost_1_61_0" -DBOOST_LIBRARYDIR="C:/projects/boost_1_61_0/stage/32/lib"
       } else {
-        cmake .. -G "Visual Studio 14 2015 Win64" -DBOOST_ROOT="C:\projects\boost_1_61_0" -DBOOST_LIBRARYDIR="C:\projects\boost_1_61_0\stage\64\lib"
+        cmake .. -G "Visual Studio 14 2015 Win64" -DBOOST_ROOT="C:/projects/boost_1_61_0" -DBOOST_LIBRARYDIR="C:/projects/boost_1_61_0/stage/64/lib"
       }
 
 build: