diff --git a/uisimulator/win32/dir-win32.c b/uisimulator/win32/dir-win32.c
index 44663b908e..09ca45c354 100644
--- a/uisimulator/win32/dir-win32.c
+++ b/uisimulator/win32/dir-win32.c
@@ -89,4 +89,10 @@ struct dirent *readdir (
 
     
     return &dir->fd;
-}
\ No newline at end of file
+}
+
+void fat_size(unsigned int* size, unsigned int* free)
+{
+    *size = 2049;
+    *free = 1037;
+}