diff --git a/CMakeModules/TargetOsAndCpu.cmake b/CMakeModules/TargetOsAndCpu.cmake
index 3ab292b..bedcffc 100644
--- a/CMakeModules/TargetOsAndCpu.cmake
+++ b/CMakeModules/TargetOsAndCpu.cmake
@@ -75,8 +75,7 @@ if (UNIX)
     list(APPEND LIBWEBRTC_REQUIRED_CXX_FLAGS "-pthread")
   endif()
 
-  list(APPEND LIBWEBRTC_DEFINITIONS
-       WEBRTC_POSIX _GLIBCXX_USE_CXX11_ABI=0 _CRT_SECURE_NO_WARNINGS)
+  list(APPEND LIBWEBRTC_DEFINITIONS WEBRTC_POSIX _GLIBCXX_USE_CXX11_ABI=0)
 elseif (WIN32)
   set(LIBWEBRTC_REQUIRED_C_FLAGS_DEBUG "/MTd")
   set(LIBWEBRTC_REQUIRED_C_FLAGS_RELEASE "/MT")