diff --git a/kernel/busses/i2c-isa.c b/kernel/busses/i2c-isa.c
index 7c0e38d4..53cb7a44 100644
--- a/kernel/busses/i2c-isa.c
+++ b/kernel/busses/i2c-isa.c
@@ -31,10 +31,13 @@
 #include <linux/i2c.h>
 #include "version.h"
 
+static u32 isa_func(struct i2c_adapter *adapter);
+
 /* This is the actual algorithm we define */
 static struct i2c_algorithm isa_algorithm = {
 	.name		= "ISA bus algorithm",
 	.id		= I2C_ALGO_ISA,
+	.functionality	= isa_func,
 };
 
 /* There can only be one... */
@@ -45,6 +48,12 @@ static struct i2c_adapter isa_adapter = {
 	.algo		= &isa_algorithm,
 };
 
+/* We can't do a thing... */
+static u32 isa_func(struct i2c_adapter *adapter)
+{
+	return 0;
+}
+
 static int __init i2c_isa_init(void)
 {
 	printk("i2c-isa.o version %s (%s)\n", LM_VERSION, LM_DATE);