diff --git a/CHANGELOG.md b/CHANGELOG.md
index 2b347a52..321990b1 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -13,6 +13,12 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Print error information about HTTP 401 instead of "Unable to determine".
 - Improved wording of remote service error messages.
 
+### Changed
+
+- `qualities` (inside `quality_profiles`) is now a "Replace" merge operation instead of "Add". This
+  means only one YAML file manages the full list of qualities. Either an include does it, or you
+  override the full list in your configuration file. There is no longer any combination.
+
 ## [5.4.1] - 2023-09-12
 
 ### Fixed
diff --git a/src/Recyclarr.TrashLib.Config/Parsing/PostProcessing/ConfigMerging/ServiceConfigMerger.cs b/src/Recyclarr.TrashLib.Config/Parsing/PostProcessing/ConfigMerging/ServiceConfigMerger.cs
index 07ec9e28..14d397d4 100644
--- a/src/Recyclarr.TrashLib.Config/Parsing/PostProcessing/ConfigMerging/ServiceConfigMerger.cs
+++ b/src/Recyclarr.TrashLib.Config/Parsing/PostProcessing/ConfigMerging/ServiceConfigMerger.cs
@@ -80,7 +80,7 @@ public abstract class ServiceConfigMerger<T> where T : ServiceConfigYaml
                     .Distinct(StringComparer.InvariantCultureIgnoreCase)
                     .ToList()))
             }),
-            Qualities = Combine(a.Qualities, b.Qualities, (a1, b1) => a1.Concat(b1).ToList())
+            Qualities = b.Qualities ?? a.Qualities
         };
     }
 }
diff --git a/src/tests/Recyclarr.TrashLib.Config.Tests/Parsing/PostProcessing/ConfigMerging/ServiceConfigMergerTest.cs b/src/tests/Recyclarr.TrashLib.Config.Tests/Parsing/PostProcessing/ConfigMerging/ServiceConfigMergerTest.cs
index c926261d..caa96d4a 100644
--- a/src/tests/Recyclarr.TrashLib.Config.Tests/Parsing/PostProcessing/ConfigMerging/ServiceConfigMergerTest.cs
+++ b/src/tests/Recyclarr.TrashLib.Config.Tests/Parsing/PostProcessing/ConfigMerging/ServiceConfigMergerTest.cs
@@ -498,12 +498,6 @@ public class ServiceConfigMergerTest
                     },
                     Qualities = new[]
                     {
-                        new QualityProfileQualityConfigYaml
-                        {
-                            Enabled = true,
-                            Name = "quality1",
-                            Qualities = new[] {"quality"}
-                        },
                         new QualityProfileQualityConfigYaml
                         {
                             Enabled = false,