diff --git a/lights.js b/lights.js
index 7cd0509..5e00c04 100644
--- a/lights.js
+++ b/lights.js
@@ -77,6 +77,9 @@ function fade(index) {
 
   var current_tick = Math.floor((diff_cr / diff_r) * fade_ticks);
 
+  if (diff_r == 0) {
+    current_tick = fade_ticks;
+  }
   // console.log(`original: ${original.r} ${original.g} ${original.b}\n` +
   //   `current:  ${current.r} ${current.g} ${current.b}\n` +
   //   `final:  ${final.r} ${final.g} ${final.b}\n` +