diff --git a/lib/CMakeLists.txt b/lib/CMakeLists.txt
index 2043294..e273393 100644
--- a/lib/CMakeLists.txt
+++ b/lib/CMakeLists.txt
@@ -61,6 +61,9 @@ if(MSVC)
     list(APPEND VORBIS_SOURCES ../win32/vorbis.def)
     list(APPEND VORBISENC_SOURCES ../win32/vorbisenc.def)
     list(APPEND VORBISFILE_SOURCES ../win32/vorbisfile.def)
+    add_definitions(-D_CRT_SECURE_NO_WARNINGS)
+    add_definitions(-D_CRT_SECURE_NO_DEPRECATE)
+    add_definitions(-D_CRT_NONSTDC_NO_DEPRECATE)
 endif()
 
 include_directories(../include)