diff --git a/src/ops.c b/src/ops.c
index 4c82835..920b985 100644
--- a/src/ops.c
+++ b/src/ops.c
@@ -125,6 +125,7 @@ dosCommand(const BYTE lfn, const BYTE drive, const BYTE sec_addr, const char *cm
   int res;
   if (cbm_open(lfn, drive, sec_addr, cmd) != 0)
     {
+      cbm_close(lfn);
       return _oserror;
     }