diff --git a/src/sudoku.s b/src/sudoku.s
index 7c48ae4..20a2170 100644
--- a/src/sudoku.s
+++ b/src/sudoku.s
@@ -43,6 +43,8 @@ START:  MOVE  P,[-PDLLEN,,PDL-1]       ;Initialize the stack.
         PUSHJ P,PUTLN
         MOVE  A,[BPTR,,FNAME2]
         PUSHJ P,PUTLN
+        MOVE  A,000
+        MOVEM A,PFLAGS
         MOVE  A,[BPTR,,LOADING]        ;Print the loading message
         PUSHJ P,OUTSTR
         MOVEI A,FNAME1                 ;Store the first file name in A