diff --git a/CMakeLists.txt b/CMakeLists.txt
index 9876a0d7ef..5e4746418d 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -10,6 +10,11 @@ endif()
 include("${CMAKE_CURRENT_SOURCE_DIR}/cmake/macros/TargetPython.cmake")
 target_python()
 
+if (WIN32)
+    # Force x64 toolset
+    set(CMAKE_GENERATOR_TOOLSET "host=x64" CACHE STRING "64-bit toolset" FORCE)
+endif()
+
 # set our OS X deployment target
 # (needs to be set before first project() call and before prebuild.py)
 # Will affect VCPKG dependencies