diff --git a/leds.cpp b/leds.cpp
index e2acef3..808848a 100644
--- a/leds.cpp
+++ b/leds.cpp
@@ -45,7 +45,7 @@ void AddressableLeds::set_frequency(double new_pattern_cycle_frequency)
 
 void AddressableLeds::calc_rainbow_()
 {
-    unsigned int times_to_increment = (millis() - last_tick_time_) / pattern_update_period_ms_;
+    long int times_to_increment = (millis() - last_tick_time_) / pattern_update_period_ms_;
     if (times_to_increment > 0)
     {
         last_tick_time_ = millis();