diff --git a/lib/letter-avatars.js b/lib/letter-avatars.js
index 437e3e7..767a2ef 100644
--- a/lib/letter-avatars.js
+++ b/lib/letter-avatars.js
@@ -5,7 +5,10 @@ var randomcolor = require('randomcolor');
 
 // core
 module.exports = function(name) {
-    var color = randomcolor({seed: name});
+    var color = randomcolor({
+        seed: name,
+        luminosity: 'dark',
+    });
     var letter = name.substring(0, 1).toUpperCase();
 
     var svg = '<?xml version="1.0" encoding="UTF-8" standalone="no"?>';