diff --git a/Src/IACore/CMakeLists.txt b/Src/IACore/CMakeLists.txt
index ab59054..c516c62 100644
--- a/Src/IACore/CMakeLists.txt
+++ b/Src/IACore/CMakeLists.txt
@@ -2,3 +2,4 @@
 add_library(IACore STATIC imp/cpp/dummy.cpp)
 
 target_include_directories(IACore PUBLIC inc/hpp imp/inl)
+target_compile_definitions(IACORE PUBLIC _CRT_SECURE_NO_WARNINGS)