diff --git a/left/src/module.h b/left/src/module.h
index 497b327..098d50c 100644
--- a/left/src/module.h
+++ b/left/src/module.h
@@ -4,6 +4,7 @@
 // Macros:
 
     #define MODULE_PROTOCOL_VERSION 1
+    #define MODULE_ID ModuleId_LeftKeyboardHalf
     #define MODULE_KEY_COUNT (KEYBOARD_MATRIX_ROWS_NUM * KEYBOARD_MATRIX_COLS_NUM)
     #define MODULE_HAS_POINTER false
 
diff --git a/left/src/slave_protocol_handler.c b/left/src/slave_protocol_handler.c
index 5d6523c..9e836e7 100644
--- a/left/src/slave_protocol_handler.c
+++ b/left/src/slave_protocol_handler.c
@@ -71,7 +71,7 @@ void SlaveTxHandler(void)
                     break;
                 }
                 case SlaveProperty_ModuleId: {
-                    TxMessage.data[0] = ModuleId_LeftKeyboardHalf;
+                    TxMessage.data[0] = MODULE_ID;
                     TxMessage.length = 1;
                     break;
                 }