diff --git a/libraries/Ticker/src/Ticker.cpp b/libraries/Ticker/src/Ticker.cpp
index ce5cf693..1deeb7fb 100644
--- a/libraries/Ticker/src/Ticker.cpp
+++ b/libraries/Ticker/src/Ticker.cpp
@@ -43,9 +43,9 @@ void Ticker::_attach_ms(uint32_t milliseconds, bool repeat, callback_with_arg_t
   }
   esp_timer_create(&_timerConfig, &_timer);
   if (repeat) {
-    esp_timer_start_periodic(_timer, milliseconds * 1000);
+    esp_timer_start_periodic(_timer, milliseconds * 1000ULL);
   } else {
-    esp_timer_start_once(_timer, milliseconds * 1000);
+    esp_timer_start_once(_timer, milliseconds * 1000ULL);
   }
 }