diff --git a/src/Jackett/Models/TorznabCapabilities.cs b/src/Jackett/Models/TorznabCapabilities.cs
index e24c921b6..be656bcb8 100644
--- a/src/Jackett/Models/TorznabCapabilities.cs
+++ b/src/Jackett/Models/TorznabCapabilities.cs
@@ -138,7 +138,7 @@ namespace Jackett.Models
             lhs.MovieSearchAvailable = lhs.MovieSearchAvailable || rhs.MovieSearchAvailable;
             lhs.SupportsTVRageSearch = lhs.SupportsTVRageSearch || rhs.SupportsTVRageSearch;
             lhs.SupportsImdbSearch = lhs.SupportsImdbSearch || rhs.SupportsImdbSearch;
-            lhs.Categories.AddRange(rhs.Categories.Except(lhs.Categories));
+            lhs.Categories.AddRange(rhs.Categories.Where(x => x.ID < 100000).Except(lhs.Categories)); // exclude indexer specific categories (>= 100000)
 
             return lhs;
         }