diff --git a/src/msdos.c b/src/msdos.c
index c90e9766579496a1e4a07d2fe75c0c53915f3617..e7df9b13f1fc7cba152e6c488188bbe853ffb21c 100644
--- a/src/msdos.c
+++ b/src/msdos.c
@@ -2091,6 +2091,8 @@ getdefdir (drive, dst)
 {
   union REGS regs;
 
+  *dst++ = (drive) ? drive + 'A' - 1 : getdisk () + 'A';
+  *dst++ = ':'
   *dst++ = '/';
   regs.h.dl = drive;
 #if __DJGPP__ > 1