diff --git a/lv_conf_template.h b/lv_conf_template.h
index 77b97b11b8..5667e585cf 100644
--- a/lv_conf_template.h
+++ b/lv_conf_template.h
@@ -442,7 +442,7 @@ typedef void * lv_obj_user_data_t;
 /*Chart (dependencies: -)*/
 #define LV_USE_CHART    1
 #if LV_USE_CHART
-#  define LV_CHART_AXIS_TICK_LABEL_MAX_LEN    20
+#  define LV_CHART_AXIS_TICK_LABEL_MAX_LEN    256
 #endif
 
 /*Container (dependencies: -*/
diff --git a/src/lv_conf_checker.h b/src/lv_conf_checker.h
index 4b0d9a67d1..1eb0b9c5bd 100644
--- a/src/lv_conf_checker.h
+++ b/src/lv_conf_checker.h
@@ -621,7 +621,7 @@
 #endif
 #if LV_USE_CHART
 #ifndef LV_CHART_AXIS_TICK_LABEL_MAX_LEN
-#  define LV_CHART_AXIS_TICK_LABEL_MAX_LEN    20
+#  define LV_CHART_AXIS_TICK_LABEL_MAX_LEN    256
 #endif
 #endif