diff --git a/webtemplate.d b/webtemplate.d
index c5d6ee0..cfb9d36 100644
--- a/webtemplate.d
+++ b/webtemplate.d
@@ -50,6 +50,7 @@ Document renderTemplate(string templateName, var context = var.emptyObject, var
 		};
 
 		context.dayOfWeek = function string(string s) {
+			import std.datetime;
 			return daysOfWeekFullNames[DateTime.fromISOExtString(s).dayOfWeek];
 		};