diff --git a/appveyor.yml b/appveyor.yml
index f208e84b..16156be8 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -116,9 +116,9 @@ init:
 - if "%APPVEYOR_BUILD_WORKER_IMAGE%"=="Visual Studio 2017" (set CMAKE_GENERATOR=Visual Studio 15 2017%arch%&&set parallelism=/maxcpucount&&set logger=/logger:"C:\Program Files\AppVeyor\BuildAgent\Appveyor.MSBuildLogger.dll")
 - if "%APPVEYOR_BUILD_WORKER_IMAGE%"=="Visual Studio 2015" (set CMAKE_GENERATOR=Visual Studio 14 2015%arch%&&set parallelism=/maxcpucount&&set logger=/logger:"C:\Program Files\AppVeyor\BuildAgent\Appveyor.MSBuildLogger.dll")
 - if "%APPVEYOR_BUILD_WORKER_IMAGE%"=="Visual Studio 2013" (set CMAKE_GENERATOR=Visual Studio 12 2013%arch%&&set parallelism=/maxcpucount&&set logger=/logger:"C:\Program Files\AppVeyor\BuildAgent\Appveyor.MSBuildLogger.dll")
-- if "%MINGW_VERSION%"=="5.3.0" (set CMAKE_GENERATOR=Ninja%%set build_type=-DCMAKE_BUILD_TYPE=Release -DCMAKE_CXX_COMPILER=g++.exe -DCMAKE_C_COMPILER=gcc.exe)
-- if "%MINGW_VERSION%"=="6.3.0" (set CMAKE_GENERATOR=Ninja&&set build_type=-DCMAKE_BUILD_TYPE=Release -DCMAKE_CXX_COMPILER=g++.exe -DCMAKE_C_COMPILER=gcc.exe)
-- if "%LLVM_VERSION%"=="4.0.0" (set CMAKE_GENERATOR=Ninja&&set build_type=-DCMAKE_BUILD_TYPE=Release -DCMAKE_CXX_COMPILER=clang-cl.exe -DCMAKE_C_COMPILER=clang-cl.exe)
+- if "%MINGW_VERSION%"=="5.3.0" (set CMAKE_GENERATOR=Ninja%%set build_type=-DCMAKE_BUILD_TYPE=Release -DCMAKE_CXX_COMPILER=g++.exe -DCMAKE_C_COMPILER=gcc.exe&&set parallelism=&&set logger=)
+- if "%MINGW_VERSION%"=="6.3.0" (set CMAKE_GENERATOR=Ninja&&set build_type=-DCMAKE_BUILD_TYPE=Release -DCMAKE_CXX_COMPILER=g++.exe -DCMAKE_C_COMPILER=gcc.exe&&set parallelism=&&set logger=)
+- if "%LLVM_VERSION%"=="4.0.0" (set CMAKE_GENERATOR=Ninja&&set build_type=-DCMAKE_BUILD_TYPE=Release -DCMAKE_CXX_COMPILER=clang-cl.exe -DCMAKE_C_COMPILER=clang-cl.exe&&set parallelism=&&set logger=)
 # # Last printouts
   # print out generator information
 - echo cmake generator is `%CMAKE_GENERATOR%` using special flags logger=`%logger%` parallelism=`%parallelism%`