diff --git a/mg_bt/i2cmodule/i2cnode.cpp b/mg_bt/i2cmodule/i2cnode.cpp
index 6d3e333..3cf0d52 100644
--- a/mg_bt/i2cmodule/i2cnode.cpp
+++ b/mg_bt/i2cmodule/i2cnode.cpp
@@ -25,7 +25,7 @@ class MgI2c : public rclcpp::Node {
 
         rclcpp::Rate rate(100);
 
-        while (ch == 0 || (ch < 256 && ch > 0)) {
+        while (ch == 0 || (ch > 255 || ch < 0)) {
             ch = i2c_smbus_read_byte(i2c_fd_);
             rate.sleep();
         }