diff --git a/src/drivers/bus/isa_ids.c b/src/drivers/bus/isa_ids.c
index 85175e04..a175ed45 100644
--- a/src/drivers/bus/isa_ids.c
+++ b/src/drivers/bus/isa_ids.c
@@ -13,14 +13,14 @@ char * isa_id_string ( uint16_t vendor, uint16_t product ) {
 	int i;
 
 	/* Vendor ID is a compressed ASCII string */
-	vendor = __bswap_16 ( vendor );
+	vendor = bswap_16 ( vendor );
 	for ( i = 2 ; i >= 0 ; i-- ) {
 		buf[i] = ( 'A' - 1 + ( vendor & 0x1f ) );
 		vendor >>= 5;
 	}
 	
 	/* Product ID is a 4-digit hex string */
-	sprintf ( &buf[3], "%hx", __bswap_16 ( product ) );
+	sprintf ( &buf[3], "%hx", bswap_16 ( product ) );
 
 	return buf;
 }