diff --git a/Utils/known-sets.txt b/Utils/known-sets.txt
index dccc840c677..3397c42b57c 100644
--- a/Utils/known-sets.txt
+++ b/Utils/known-sets.txt
@@ -8,7 +8,7 @@ Avacyn Restored|avacynrestored|
 Betrayers of Kamigawa|betrayersofkamigawa|
 Born of the Gods|bornofthegods|
 Champions of Kamigawa|championsofkamigawa|
-Classic Sixth Edition|sixthedition|
+Classic Sixth Edition|classicsixthedition|
 Coldsnap|coldsnap|
 Commander 2013 Edition|commander2013|
 Commander 2014 Edition|commander2014|
@@ -132,4 +132,4 @@ Weatherlight|weatherlight|
 World Magic Cup Qualifier|worldmagiccupqualifier|
 Worldwake|worldwake|
 WPN Gateway|wpngateway|
-Zendikar|zendikar|
\ No newline at end of file
+Zendikar|zendikar|