diff --git a/src/zip.c b/src/zip.c
index 7868dff..09f4f52 100644
--- a/src/zip.c
+++ b/src/zip.c
@@ -46,6 +46,13 @@
 #define fileno _fileno
 #endif
 
+#if defined(__TINYC__) && (defined(_WIN32) || defined(_WIN64))
+#include <io.h>
+
+#define ftruncate(fd, sz) (-(_chsize_s((fd), (sz)) != 0))
+#define fileno _fileno
+#endif
+
 #ifndef HAS_DEVICE
 #define HAS_DEVICE(P) 0
 #endif