diff --git a/src/others/sysmon/lv_sysmon.c b/src/others/sysmon/lv_sysmon.c
index abee3dce3..1c0654f1a 100644
--- a/src/others/sysmon/lv_sysmon.c
+++ b/src/others/sysmon/lv_sysmon.c
@@ -54,6 +54,11 @@
     static void mem_observer_cb(lv_observer_t * observer, lv_subject_t * subject);
 #endif
 
+/**********************
+ *  STATIC PROTOTYPES
+ **********************/
+static lv_obj_t * _lv_sysmon_create_label(lv_obj_t * parent);
+
 /**********************
  *  STATIC VARIABLES
  **********************/