diff --git a/sprout/functional/less_equal.hpp b/sprout/functional/less_equal.hpp
index 41e5fada..fdf78c60 100644
--- a/sprout/functional/less_equal.hpp
+++ b/sprout/functional/less_equal.hpp
@@ -16,7 +16,7 @@
 namespace sprout {
 
 	// 20.8.5 Comparisons
-	template<typename T>
+	template<typename T = void>
 	struct less_equal {
 	public:
 		typedef T first_argument_type;