diff --git a/src/NzbDrone.Api/Qualities/QualityDefinitionModule.cs b/src/NzbDrone.Api/Qualities/QualityDefinitionModule.cs
index d675d54bc..89c7060ad 100644
--- a/src/NzbDrone.Api/Qualities/QualityDefinitionModule.cs
+++ b/src/NzbDrone.Api/Qualities/QualityDefinitionModule.cs
@@ -27,7 +27,7 @@ namespace NzbDrone.Api.Qualities
 
         private QualityDefinitionResource GetById(int id)
         {
-            return _qualityDefinitionService.Get((Quality)id).InjectTo<QualityDefinitionResource>();
+            return _qualityDefinitionService.GetById(id).InjectTo<QualityDefinitionResource>();
         }
 
         private List<QualityDefinitionResource> GetAll()
diff --git a/src/NzbDrone.Core/Qualities/QualityDefinitionService.cs b/src/NzbDrone.Core/Qualities/QualityDefinitionService.cs
index a388f1667..b21a01626 100644
--- a/src/NzbDrone.Core/Qualities/QualityDefinitionService.cs
+++ b/src/NzbDrone.Core/Qualities/QualityDefinitionService.cs
@@ -12,6 +12,7 @@ namespace NzbDrone.Core.Qualities
     {
         void Update(QualityDefinition qualityDefinition);
         List<QualityDefinition> All();
+        QualityDefinition GetById(Int32 id);
         QualityDefinition Get(Quality quality);
     }
 
@@ -44,6 +45,11 @@ namespace NzbDrone.Core.Qualities
         {
             return GetAll().Values.ToList();
         }
+
+        public QualityDefinition GetById(Int32 id)
+        {
+            return GetAll().Values.Single(v => v.Id == id);
+        }
         
         public QualityDefinition Get(Quality quality)
         {