diff --git a/js/gamutable.es6.js b/js/gamutable.es6.js
index d623500..66e659b 100644
--- a/js/gamutable.es6.js
+++ b/js/gamutable.es6.js
@@ -26,7 +26,9 @@ const orderBy = (arr, props, orders) =>
 	arr.sort((a, b) =>
 		props.reduce((acc, prop, i) => {
 			if (acc === 0) {
-				const [p1, p2] = orders && orders[i] === 'desc' ? [b[prop], a[prop]] : [a[prop], b[prop]];
+				let [p1, p2] = orders && orders[i] === 'desc' ? [b[prop], a[prop]] : [a[prop], b[prop]];
+				p1 = typeof p1 === 'string' ? p1.toLowerCase() : p1;
+				p2 = typeof p2 === 'string' ? p2.toLowerCase() : p2;
 				acc = p1 > p2 ? 1 : p1 < p2 ? -1 : 0;
 			}
 			return acc;
diff --git a/js/gamutable.js b/js/gamutable.js
index c9c0fee..48ded9a 100644
--- a/js/gamutable.js
+++ b/js/gamutable.js
@@ -43,6 +43,8 @@ var orderBy = function orderBy(arr, props, orders) {
             p1 = _ref2[0],
             p2 = _ref2[1];
 
+        p1 = typeof p1 === 'string' ? p1.toLowerCase() : p1;
+        p2 = typeof p2 === 'string' ? p2.toLowerCase() : p2;
         acc = p1 > p2 ? 1 : p1 < p2 ? -1 : 0;
       }