diff --git a/src/dos_m65/filesystem_cbm/fs_cbm_nextfileblock.s b/src/dos_m65/filesystem_cbm/fs_cbm_nextfileblock.s
index 135af7db..27403902 100644
--- a/src/dos_m65/filesystem_cbm/fs_cbm_nextfileblock.s
+++ b/src/dos_m65/filesystem_cbm/fs_cbm_nextfileblock.s
@@ -69,7 +69,7 @@ fs_cbm_nextfileblock_got_ts:
 	; Sector with data is located in the 1st half of the buffer
 
 	lda SHARED_BUF_1+0
-	beq @exit
+	bne @exit
 
 	; Less than a full sector is used
 
@@ -83,7 +83,7 @@ fs_cbm_nextfileblock_got_ts:
 	inc FD_ACPTR_PTR+1
 
 	lda SHARED_BUF_1+$100+0
-	beq @exit
+	bne @exit
 
 	; Less than a full sector is used