diff --git a/tools/qt-faststart.c b/tools/qt-faststart.c
index 8d2196c683..f33d6fa80c 100644
--- a/tools/qt-faststart.c
+++ b/tools/qt-faststart.c
@@ -32,6 +32,9 @@
 #ifdef __MINGW32__
 #define fseeko(x, y, z) fseeko64(x, y, z)
 #define ftello(x)       ftello64(x)
+#elif defined(_WIN32)
+#define fseeko(x, y, z) _fseeki64(x, y, z)
+#define ftello(x)       _ftelli64(x)
 #endif
 
 #define BE_16(x) ((((uint8_t*)(x))[0] <<  8) | ((uint8_t*)(x))[1])