Index: thunar-vfs-info.c
===================================================================
--- thunar-vfs-info.c	(revision 19729)
+++ thunar-vfs-info.c	(working copy)
@@ -240,11 +240,11 @@
     return FALSE;
 
 #if defined(HAVE_STATFS)
-  if (statfs (absolute_path, &statfsb) == 0)
+  if (statfs (absolute_path, &statfsb, sizeof statfsb, 0) == 0)
     {
       /* good old BSD way */
       if (G_LIKELY (free_space_return != NULL))
-        *free_space_return = (statfsb.f_bavail * statfsb.f_bsize);
+        *free_space_return = (statfsb.f_bfree * statfsb.f_bsize);
       return TRUE;
     }
 #elif defined(HAVE_STATVFS)