diff --git a/data.n3 b/data.n3
index 2d98153f..45fa4d6b 100644
--- a/data.n3
+++ b/data.n3
@@ -9,4 +9,4 @@
 			   <http://dig.csail.mit.edu/People/kennyluck#I>,
 			   <http://me.bobchao.net/card#i>;
 	foaf:homepage <http://moztw.org/>;
-	foaf:birthday "09-06";
+	foaf:birthday "09-06".