diff --git a/src/disk/hdc_ide_sff8038i.c b/src/disk/hdc_ide_sff8038i.c
index 733868cc3..b00b2a66d 100644
--- a/src/disk/hdc_ide_sff8038i.c
+++ b/src/disk/hdc_ide_sff8038i.c
@@ -370,13 +370,15 @@ void
 sff_bus_master_set_irq(int channel, void *priv)
 {
     sff8038i_t *dev = (sff8038i_t *) priv;
+    uint8_t irq = !!(channel & 0x40);
+
     if (!(dev->status & 0x04) || (channel & 0x40)) {
 	dev->status &= ~4;
 	dev->status |= (channel >> 4);
     }
 
     channel &= 0x01;
-    if (dev->status & 0x04) {
+    if (irq) {
 	sff_log("SFF8038i: Channel %i IRQ raise\n", channel);
 	if (dev->irq_mode[channel] == 3)
 		picintlevel(1 << dev->irq_line);