diff --git a/CMakeLists.txt b/CMakeLists.txt
index 535e8e6f..b799a62f 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -32,7 +32,8 @@ endif()
 
 # Turn compiler warnings up to 11
 if ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "MSVC")
-  add_cxx_compiler_flag(-W4)
+  add_cxx_compiler_flag(-W4)
+  add_definitions(-D_CRT_SECURE_NO_WARNINGS)
 else()
   add_cxx_compiler_flag(-Wall)
 endif()