diff --git a/src/lib/internal.h b/src/lib/internal.h
index f4f21db4d..469cf37f6 100644
--- a/src/lib/internal.h
+++ b/src/lib/internal.h
@@ -1780,7 +1780,7 @@ prefix_data(const char* base){
 static inline int
 tty_check(int fd){
 #ifdef __MINGW64__
-  return fd >= 0 ? 1 : 0;
+  return _isatty(fd);
 #endif
   return isatty(fd);
 }