diff --git a/CHANGELOG.md b/CHANGELOG.md
index 4297bdcb..09705e6b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -14,6 +14,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 - `DialogueRunner.CommandDispatcher` is now set up on first access, rather than in `Awake`.
   - This allows other objects to work with the command dispatcher (for example, registering new methods) in their `Awake` methods, even if their `Awake` methods run before `DialogueRunner`'s.
 - `YarnCommand` and `YarnFunction` commands now allow including `.` characters in their names.
+- Fixed an issue in SerializableDictionary.cs that caused builds to fail.
 
 ### Changed
 
diff --git a/Runtime/SerializableDictionary.cs b/Runtime/SerializableDictionary.cs
index 3d662bdb..f2980969 100644
--- a/Runtime/SerializableDictionary.cs
+++ b/Runtime/SerializableDictionary.cs
@@ -262,6 +262,7 @@ protected override void SetValue(TValueStorage[] storage, int i, TValue value)
     }
 }
 
+#if UNITY_EDITOR
 namespace Yarn.Unity.Editor
 {
 
@@ -872,3 +873,4 @@ public override float GetPropertyHeight(SerializedProperty property, GUIContent
         }
     }
 }
+#endif