diff --git a/Database/Persist/MySQL.hs b/Database/Persist/MySQL.hs
--- a/Database/Persist/MySQL.hs
+++ b/Database/Persist/MySQL.hs
@@ -629,13 +629,14 @@
 
 -- | Render an action that must be done on a column.
 showAlter :: DBName -> AlterColumn' -> String
-showAlter table (n, Change col) =
+showAlter table (oldName, Change (Column n nu t def maxLen _ref)) =
     concat
     [ "ALTER TABLE "
     , escapeDBName table
     , " CHANGE "
-    , escapeDBName n
-    , showColumn col
+    , escapeDBName oldName
+    , " "
+    , showColumn (Column n nu t def maxLen Nothing)
     ]
 showAlter table (_, Add col) =
     concat
diff --git a/persistent-mysql.cabal b/persistent-mysql.cabal
--- a/persistent-mysql.cabal
+++ b/persistent-mysql.cabal
@@ -1,5 +1,5 @@
 name:            persistent-mysql
-version:         0.8.2
+version:         0.8.3
 license:         BSD3
 license-file:    LICENSE
 author:          Felipe Lessa <felipe.lessa@gmail.com>, Michael Snoyman