diff --git a/src/lv_objx/lv_lmeter.h b/src/lv_objx/lv_lmeter.h
index 576e11ffbe..6ee746ee7e 100644
--- a/src/lv_objx/lv_lmeter.h
+++ b/src/lv_objx/lv_lmeter.h
@@ -41,7 +41,7 @@ typedef struct
     int16_t cur_value;
     int16_t min_value;
     int16_t max_value;
-    uint8_t mirrored;
+    uint8_t mirrored :1;
 } lv_lmeter_ext_t;
 
 /*Styles*/