diff --git a/drivers/firewire/fw-ohci.c b/drivers/firewire/fw-ohci.c
index 0d08bf9b78c2..b72a5c1f9e69 100644
--- a/drivers/firewire/fw-ohci.c
+++ b/drivers/firewire/fw-ohci.c
@@ -1001,7 +1001,7 @@ static irqreturn_t irq_handler(int irq, void *data)
 
 	event = reg_read(ohci, OHCI1394_IntEventClear);
 
-	if (!event)
+	if (!event || !~event)
 		return IRQ_NONE;
 
 	reg_write(ohci, OHCI1394_IntEventClear, event);