diff --git a/index.js b/index.js
index 998c465..61a7698 100644
--- a/index.js
+++ b/index.js
@@ -9,9 +9,15 @@ const sortby = (properties) => (a, b) => {
     const property = properties[i]
 
     let order = -1
-    if (i + 1 < properties.length && properties[i + 1] === 'desc') {
-      order = 1
-      i++
+    if (i + 1 < properties.length) {
+      const next = properties[i + 1]
+
+      if (next === 'desc') {
+        order = 1
+        i++
+      } else if (next === 'asc') {
+        i++
+      }
     }
 
     const compare = collator.compare(a[property], b[property])