diff --git a/lib/index.js b/lib/index.js
index 8865485..0353f48 100644
--- a/lib/index.js
+++ b/lib/index.js
@@ -108,30 +108,16 @@ const Channel = function(length = 0) {
 
   const readOnly = Object.freeze(
     Object.assign(Object.create(prototype), {
-      concat: (...args) => {
+      concat: (first, ...rest) => {
         const output = Channel();
 
         (async () => {
           await readOnly.forEach(output.push);
 
-          for (let index = 0; index < args.length; index++) {
-            const arg = args[index];
-
-            /* For some reason the following code works in Mocha but not in
-              Wallaby.js:
-
-              await (Channel.isChannel(arg)
-                ? arg.forEach(output.push)
-                : output.push(arg));
-
-              If we use the 'if' statement below then Wallaby.js is happy.
-            */
-
-            if (Channel.isChannel(arg)) {
-              await arg.forEach(output.push);
-            } else {
-              await output.push(arg);
-            }
+          if (Channel.isChannel(first)) {
+            await first.concat(...rest).forEach(output.push);
+          } else {
+            await output.push(first);
           }
 
           await output.close();