diff --git a/hw/scsi/esp.c b/hw/scsi/esp.c
index b668acef82..000e45a624 100644
--- a/hw/scsi/esp.c
+++ b/hw/scsi/esp.c
@@ -213,7 +213,7 @@ static int esp_select(ESPState *s)
     if (!s->current_dev) {
         /* No such drive */
         s->rregs[ESP_RSTAT] = 0;
-        s->rregs[ESP_RINTR] |= INTR_DC;
+        s->rregs[ESP_RINTR] = INTR_DC;
         s->rregs[ESP_RSEQ] = SEQ_0;
         esp_raise_irq(s);
         return -1;