diff --git a/src/main/java/blue/lapis/nocturne/gui/io/mappings/MappingsOpenDialogHelper.java b/src/main/java/blue/lapis/nocturne/gui/io/mappings/MappingsOpenDialogHelper.java
index 4e34c90..24c5f1f 100644
--- a/src/main/java/blue/lapis/nocturne/gui/io/mappings/MappingsOpenDialogHelper.java
+++ b/src/main/java/blue/lapis/nocturne/gui/io/mappings/MappingsOpenDialogHelper.java
@@ -76,7 +76,7 @@ public static void openMappings() throws IOException {
             try (MappingsReader reader = MappingReaderType.fromExtensionFilter(fileChooser.getSelectedExtensionFilter())
                     .constructReader(new BufferedReader(new FileReader(selectedFile)))) {
                 MappingContext context = reader.read();
-                Main.getMappingContext().merge(context);
+                Main.getMappingContext().assimilate(context);
                 MainController.INSTANCE.updateClassViews();
                 Main.getMappingContext().setDirty(false);
             }
diff --git a/src/main/java/blue/lapis/nocturne/mapping/MappingContext.java b/src/main/java/blue/lapis/nocturne/mapping/MappingContext.java
index 877dc1b..a5c294c 100644
--- a/src/main/java/blue/lapis/nocturne/mapping/MappingContext.java
+++ b/src/main/java/blue/lapis/nocturne/mapping/MappingContext.java
@@ -64,25 +64,26 @@ public ImmutableMap<String, TopLevelClassMapping> getMappings() {
     public void addMapping(TopLevelClassMapping mapping, boolean updateClassViews) {
         mappings.put(mapping.getObfuscatedName(), mapping);
         mapping.initialize(updateClassViews);
-
-        setDirty(true);
     }
 
     //TODO: probably add a removeMapping method at some point
 
     /**
-     * Merges the given {@link MappingContext} into the current one.
+     * Merges the given {@link MappingContext} into the current one. All
+     * mappings contained by the passed context will be mutated to indicate that
+     * the current {@link MappingContext} is now their parent.
      *
      * <p>Note that mappings from the provided set will take precedence over
      * existing ones if they are already present.</p>
      *
      * @param context The {@link MappingContext} to merge
      */
-    public void merge(MappingContext context) {
+    public void assimilate(MappingContext context) {
         this.mappings.putAll(context.getMappings());
         if (!context.getMappings().isEmpty()) {
             setDirty(true);
         }
+        context.getMappings().values().forEach(m -> m.setContext(this));
     }
 
     /**
diff --git a/src/main/java/blue/lapis/nocturne/mapping/model/ClassMapping.java b/src/main/java/blue/lapis/nocturne/mapping/model/ClassMapping.java
index b105a53..cd8aeed 100644
--- a/src/main/java/blue/lapis/nocturne/mapping/model/ClassMapping.java
+++ b/src/main/java/blue/lapis/nocturne/mapping/model/ClassMapping.java
@@ -99,7 +99,6 @@ public ImmutableMap<String, InnerClassMapping> getInnerClassMappings() {
     void addFieldMapping(FieldMapping mapping) {
         mapping.initialize();
         fieldMappings.put(mapping.getObfuscatedName(), mapping);
-        getContext().setDirty(true);
     }
 
     /**
@@ -142,8 +141,6 @@ public void removeMethodMapping(String methodName) {
     void addInnerClassMapping(InnerClassMapping mapping) {
         mapping.initialize();
         innerClassMappings.put(mapping.getObfuscatedName(), mapping);
-
-        getContext().setDirty(true);
     }
 
     /**
diff --git a/src/main/java/blue/lapis/nocturne/mapping/model/TopLevelClassMapping.java b/src/main/java/blue/lapis/nocturne/mapping/model/TopLevelClassMapping.java
index d4f5e32..f0c703a 100644
--- a/src/main/java/blue/lapis/nocturne/mapping/model/TopLevelClassMapping.java
+++ b/src/main/java/blue/lapis/nocturne/mapping/model/TopLevelClassMapping.java
@@ -38,7 +38,7 @@
  */
 public class TopLevelClassMapping extends ClassMapping {
 
-    private final MappingContext parent;
+    private MappingContext parent;
 
     /**
      * Constructs a new {@link TopLevelClassMapping} with the given parameters.
@@ -62,6 +62,10 @@ public MappingContext getContext() {
         return parent;
     }
 
+    public void setContext(MappingContext context) {
+        this.parent = context;
+    }
+
     @Override
     public String getFullObfuscatedName() {
         return getObfuscatedName();