diff --git a/CMakeLists.txt b/CMakeLists.txt
index d777da4..28295fd 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -13,6 +13,8 @@ elseif (WIN32)
     #   completely cross platform. For fixes to common issues arising from /permissive- visit:
     #   https://docs.microsoft.com/en-us/cpp/build/reference/permissive-standards-conformance
     set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /W3 /permissive-")
+    # disables warnings about _s variants of stdc functions
+    add_definitions(_CRT_SECURE_NO_DEPRECATE _CRT_NONSTDC_NO_DEPRECATE)
 endif ()
 
 find_package(Boost 1.71.0 REQUIRED COMPONENTS system thread)