diff --git a/kit/si570avrusb.c b/kit/si570avrusb.c
index 25a9efabc..8cd65cfba 100644
--- a/kit/si570avrusb.c
+++ b/kit/si570avrusb.c
@@ -904,7 +904,7 @@ int si570xxxusb_set_conf(RIG *rig, token_t token, const char *val)
             return -RIG_EINVAL;
         }
 
-        if (i2c_addr < 0 || i2c_addr >= (1 << 9))
+        if (i2c_addr >= (1 << 9))
         {
             return -RIG_EINVAL;
         }