diff --git a/clang_windows_toolchain.cmake b/clang_windows_toolchain.cmake
index 98bef79..afe2777 100755
--- a/clang_windows_toolchain.cmake
+++ b/clang_windows_toolchain.cmake
@@ -8,7 +8,7 @@ if(WIN32)
         set(CMAKE_CXX_COMPILER "C:/llvm/bin/clang-cl.exe")
         set(CMAKE_LINKER "C:/llvm/bin/lld-link.exe")
 
-        set(CMAKE_PREFIX_PATH "C:/Qt/Qt${QT5_VERSION}/${QT5_VERSION}/msvc2017_64/lib/cmake/Qt5")
+        set(Qt5_DIR "C:/Qt/Qt${QT5_VERSION}/${QT5_VERSION}/msvc2017_64/lib/cmake/Qt5")
         set(QT_INSTALL_PATH "C:/Qt/Qt${QT5_VERSION}/${QT5_VERSION}/msvc2017_64")
 
         set(MSVC_BASE "C:/MSVCBuildTools/MSVC")