diff --git a/c64/kernal/iec_rx_byte.s b/c64/kernal/iec_rx_byte.s
index 2d28465f..446956ce 100644
--- a/c64/kernal/iec_rx_byte.s
+++ b/c64/kernal/iec_rx_byte.s
@@ -113,5 +113,6 @@ iec_rx_set_eoi:
 	ora #$40
 	sta IOSTATUS
 	
-	clc
+	sec ; XXX check if ACPTR also uses Carry flag to indicate problems,
+	    ; currently this is used by our LOAD routine to detect file not found
 	rts