diff --git a/sample/bf.cpp b/sample/bf.cpp
index b907f95..566996b 100644
--- a/sample/bf.cpp
+++ b/sample/bf.cpp
@@ -5,7 +5,7 @@
 #include <fstream>
 #ifdef _MSC_VER
 	#pragma warning(disable : 4996) // scanf
-	#define snprintf _snprintf
+	#define snprintf _snprintf_s
 #endif
 
 class Brainfuck : public Xbyak::CodeGenerator {