diff --git a/src/NzbDrone.Core/Datastore/Migration/073_clear_ratings.cs b/src/NzbDrone.Core/Datastore/Migration/073_clear_ratings.cs
new file mode 100644
index 000000000..ef9c4074f
--- /dev/null
+++ b/src/NzbDrone.Core/Datastore/Migration/073_clear_ratings.cs
@@ -0,0 +1,20 @@
+using FluentMigrator;
+using NzbDrone.Core.Datastore.Migration.Framework;
+
+namespace NzbDrone.Core.Datastore.Migration
+{
+    [Migration(73)]
+    public class clear_ratings : NzbDroneMigrationBase
+    {
+        protected override void MainDbUpgrade()
+        {
+            Update.Table("Series")
+                  .Set(new {Ratings = "{}"})
+                  .AllRows();
+
+            Update.Table("Episodes")
+                  .Set(new { Ratings = "{}" })
+                  .AllRows();
+        }
+    }
+}
diff --git a/src/NzbDrone.Core/NzbDrone.Core.csproj b/src/NzbDrone.Core/NzbDrone.Core.csproj
index 16c5df788..4dff656ff 100644
--- a/src/NzbDrone.Core/NzbDrone.Core.csproj
+++ b/src/NzbDrone.Core/NzbDrone.Core.csproj
@@ -232,6 +232,7 @@
     <Compile Include="Datastore\Migration\069_quality_proper.cs" />
     <Compile Include="Datastore\Migration\071_unknown_quality_in_profile.cs" />
     <Compile Include="Datastore\Migration\072_history_grabid.cs" />
+    <Compile Include="Datastore\Migration\073_clear_ratings.cs" />
     <Compile Include="Datastore\Migration\070_delay_profile.cs" />
     <Compile Include="Datastore\Migration\Framework\MigrationContext.cs" />
     <Compile Include="Datastore\Migration\Framework\MigrationController.cs" />