diff --git a/.appveyor.yml b/.appveyor.yml
index fdb490c1..66d92591 100644
--- a/.appveyor.yml
+++ b/.appveyor.yml
@@ -1,12 +1,12 @@
 image: Visual Studio 2019
 environment:
-  CTEST_OUTPUT_ON_FAILURE: 1
+  CTEST_OUTPUT_ON_FAILURE: 1 
 
 build_script:
   - call "C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC\Auxiliary\Build\vcvars64.bat"
   - mkdir build
   - cd build
-  - cmake -G Ninja -DCMAKE_BUILD_TYPE=Debug -DCMAKE_C_COMPILER=cl -DCMAKE_CXX_COMPILER=cl ..
+  - cmake -G Ninja -DBOOST_ROOT=C:\Libraries\boost_1_71_0 -DCMAKE_BUILD_TYPE=Debug -DCMAKE_C_COMPILER=cl -DCMAKE_CXX_COMPILER=cl ..
   - cmake --build . -j
   - ctest