diff --git a/index.js b/index.js
index 5b44368..02e7507 100644
--- a/index.js
+++ b/index.js
@@ -9,7 +9,6 @@ if (!$Map) {
 		// `Map` is not present in this environment.
 		return false;
 	};
-	return;
 }
 
 var $mapHas = $Map ? Map.prototype.has : null;
@@ -20,7 +19,6 @@ if (!$mapHas) {
 		// `Map` does not have a `has` method
 		return false;
 	};
-	return;
 }
 
 module.exports = function isMap(x) {