diff --git a/scsi.c b/scsi.c
index 68824506..3431f3bf 100644
--- a/scsi.c
+++ b/scsi.c
@@ -99,6 +99,11 @@ print_sg_io_v3_res(struct tcb *const tcp, const kernel_ulong_t arg)
 		return;
 	}
 
+	if (sg_io.interface_id != (unsigned char) 'S') {
+		tprintf(" => interface_id=%u", sg_io.interface_id);
+		return;
+	}
+
 	if (sg_io.dxfer_direction == SG_DXFER_FROM_DEV ||
 	    sg_io.dxfer_direction == SG_DXFER_TO_FROM_DEV) {
 		uint32_t din_len = sg_io.dxfer_len;
@@ -182,6 +187,11 @@ print_sg_io_v4_res(struct tcb *const tcp, const kernel_ulong_t arg)
 		return;
 	}
 
+	if (sg_io.guard != (unsigned char) 'Q') {
+		tprintf(" => guard=%u", sg_io.guard);
+		return;
+	}
+
 	tprintf(", response[%u]=", sg_io.response_len);
 	print_sg_io_buffer(tcp, sg_io.response, sg_io.response_len);
 	din_len = sg_io.din_xfer_len;