diff --git a/vfs/smbfs.h b/vfs/smbfs.h
index 20970de13..885cef660 100644
--- a/vfs/smbfs.h
+++ b/vfs/smbfs.h
@@ -3,6 +3,7 @@
 #if !defined(__SMBFS_H)
 #define __SMBFS_H
 
-extern void smbfs_set_debug(int arg);
+extern void smbfs_set_debug (int arg);
+extern void smbfs_set_debugf (const char *filename);
 
 #endif /* __SMBFS_H*/