diff --git a/AUTHORS b/AUTHORS
index 859693c29..2353ff683 100644
--- a/AUTHORS
+++ b/AUTHORS
@@ -1,4 +1,4 @@
-This is the (likely incomplete) list of of "mruby developers".
+This is the (likely incomplete) list of "mruby developers".
 If you submit a patch to mruby, please add your name to the end
 of this list.