diff --git a/src/memtest6502.asm b/src/memtest6502.asm
index 0774af7..7c69971 100644
--- a/src/memtest6502.asm
+++ b/src/memtest6502.asm
@@ -56,11 +56,11 @@ zeroloopFF:
 	sty scrptr+2
 	sta scrptr+3
 	lda $00,Y
-	sta scrptr+3
+	sta scrptr+4
 	ldx #"Z"
-	stx scrptr+4
-	ldx #"F"
 	stx scrptr+5
+	ldx #"F"
+	stx scrptr+6
 	jmp done
 zerookFF:
 	iny