diff --git a/tasmota/xdsp_15_tm1637.ino b/tasmota/xdsp_15_tm1637.ino
index f69cbcfc3..744cf043d 100644
--- a/tasmota/xdsp_15_tm1637.ino
+++ b/tasmota/xdsp_15_tm1637.ino
@@ -995,7 +995,7 @@ void TM1637ShowTime()
       hr = 12;
   }
 
-  char tm[5];
+  char tm[9];
   if (hr < 10)
   {
     if (mn < 10)