diff --git a/compat/msvc.h b/compat/msvc.h
index d336d80670..d7525cf61d 100644
--- a/compat/msvc.h
+++ b/compat/msvc.h
@@ -18,6 +18,8 @@
 
 #undef ERROR
 
+#define ftello _ftelli64
+
 typedef int sigset_t;
 /* open for reading, writing, or both (not in fcntl.h) */
 #define O_ACCMODE     (_O_RDONLY | _O_WRONLY | _O_RDWR)