diff --git a/day_2.c b/day_2.c
index c02f24d..b6c1e62 100644
--- a/day_2.c
+++ b/day_2.c
@@ -19,7 +19,7 @@ int bufferLen;
 #ifdef _WIN32
 #define STRTOK_TS strtok_s
 #else
-#define STRTOK_TS strtok_f
+#define STRTOK_TS strtok_r
 #endif //_WIN32
 
 void main() {