diff --git a/src/dos_m65/dev_sdcard/fs_hvsr_read_file.s b/src/dos_m65/dev_sdcard/fs_hvsr_read_file.s
index a5057856..6c8bed1f 100644
--- a/src/dos_m65/dev_sdcard/fs_hvsr_read_file.s
+++ b/src/dos_m65/dev_sdcard/fs_hvsr_read_file.s
@@ -83,7 +83,7 @@ fs_hvsr_read_file:
 
 	; Check if any data was read
 
-	lda SD_ACPTR_LEN+0
+	tya
 	ora SD_ACPTR_LEN+0
 	bne @copy