diff --git a/src/ch7xxx/ch7xxx.c b/src/ch7xxx/ch7xxx.c
index 3c58165d..da02ad24 100644
--- a/src/ch7xxx/ch7xxx.c
+++ b/src/ch7xxx/ch7xxx.c
@@ -50,7 +50,7 @@ SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  */
 
 static struct ch7xxx_id_struct {
-    int vid;
+    CARD8 vid;
     char *name;
 } ch7xxx_ids[] = { 
 	{ CH7011_VID, "CH7011" },
@@ -77,7 +77,7 @@ struct ch7xxx_priv {
 
 static void ch7xxx_save(I2CDevPtr d);
 
-static char *ch7xxx_get_id(int vid)
+static char *ch7xxx_get_id(CARD8 vid)
 {
     int i;