diff --git a/reactos/subsystems/mvdm/ntvdm/dos/dos32krnl/dos.c b/reactos/subsystems/mvdm/ntvdm/dos/dos32krnl/dos.c
index 9f49650ef34..b4028a127bc 100644
--- a/reactos/subsystems/mvdm/ntvdm/dos/dos32krnl/dos.c
+++ b/reactos/subsystems/mvdm/ntvdm/dos/dos32krnl/dos.c
@@ -1054,7 +1054,7 @@ VOID WINAPI DosInt21h(LPWORD Stack)
             }
 
             /* Update the length */
-            InputBuffer->Length = Count - 1;
+            InputBuffer->Length = Count;
 
             break;
         }