diff --git a/build-appveyor.ps1 b/build-appveyor.ps1
index 4bba61d3..b76e1b7d 100644
--- a/build-appveyor.ps1
+++ b/build-appveyor.ps1
@@ -18,7 +18,7 @@ mkdir cmakebuild
 
 cd cmakebuild
 
-cmake .. -T v143 -Dembree_DIR="C:\embree-3.12.1.x64.vc14.windows" -DTBB_DIR="C:\tbb\cmake" -DCMAKE_GENERATOR_PLATFORM=x64 -DCMAKE_SYSTEM_VERSION="8.1" -DENABLE_LIGHTPREVIEW=NO -DQt5Widgets_DIR="C:\Qt\5.8\msvc2013_64\lib\cmake\Qt5Widgets"
+cmake .. -T v143 -Dembree_DIR="C:\embree-3.12.1.x64.vc14.windows" -DTBB_DIR="C:\tbb\cmake" -DCMAKE_GENERATOR_PLATFORM=x64 -DENABLE_LIGHTPREVIEW=NO -DQt5Widgets_DIR="C:\Qt\5.8\msvc2013_64\lib\cmake\Qt5Widgets"
 
 $cmakePlatform = "x64"
 
diff --git a/build-windows.ps1 b/build-windows.ps1
index 6909d9c7..ecc6d24b 100644
--- a/build-windows.ps1
+++ b/build-windows.ps1
@@ -20,7 +20,7 @@ choco install ninja
 mkdir build-windows
 cd build-windows
 
-cmake .. -GNinja -Dembree_DIR="C:\embree-3.12.1.x64.vc14.windows" -DTBB_DIR="C:\tbb\cmake" -DCMAKE_BUILD_TYPE=Release -DCMAKE_SYSTEM_VERSION="8.1"
+cmake .. -GNinja -Dembree_DIR="C:\embree-3.12.1.x64.vc14.windows" -DTBB_DIR="C:\tbb\cmake" -DCMAKE_BUILD_TYPE=Release
 
 ninja
 if ( $? -eq $false ) {