diff --git a/drivers/char/cyclades.c b/drivers/char/cyclades.c
index df5038bbcbc28647cc64eed72f0fee6fbc8c2568..4254457d391186429590769d05334d01c459bd75 100644
--- a/drivers/char/cyclades.c
+++ b/drivers/char/cyclades.c
@@ -3354,7 +3354,7 @@ static int __init cy_detect_isa(void)
 			continue;
 		}
 #ifdef MODULE
-		if (isparam && irq[i])
+		if (isparam && i < NR_CARDS && irq[i])
 			cy_isa_irq = irq[i];
 		else
 #endif