diff --git a/host/hackrf-tools/CMakeLists.txt b/host/hackrf-tools/CMakeLists.txt
index 8bf2a068..bb3a4193 100644
--- a/host/hackrf-tools/CMakeLists.txt
+++ b/host/hackrf-tools/CMakeLists.txt
@@ -32,6 +32,7 @@ set(CMAKE_MODULE_PATH ${PROJECT_SOURCE_DIR}/../cmake/modules)
 
 if(MSVC)
 include_directories(getopt)
+add_definitions(/D _CRT_SECURE_NO_WARNINGS)
 else()
 add_definitions(-Wall)
 set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -std=gnu90")