diff --git a/src/main/java/net/rptools/maptool/events/ZoneLoadedListener.java b/src/main/java/net/rptools/maptool/events/ZoneLoadedListener.java
index 2d71cedb18..ba522ea6a2 100644
--- a/src/main/java/net/rptools/maptool/events/ZoneLoadedListener.java
+++ b/src/main/java/net/rptools/maptool/events/ZoneLoadedListener.java
@@ -16,6 +16,7 @@
 
 import com.google.common.eventbus.Subscribe;
 import java.util.Collections;
+import java.util.Objects;
 import java.util.concurrent.ExecutionException;
 import net.rptools.maptool.client.MapTool;
 import net.rptools.maptool.client.events.ZoneLoaded;
@@ -30,6 +31,8 @@
 public class ZoneLoadedListener {
   private static final Logger LOGGER = LogManager.getLogger(EventMacroUtil.class);
   public static final String ON_CHANGE_MAP_CALLBACK = "onChangeMap";
+  public String priorMapID =
+      MapTool.getFrame().getCurrentZoneRenderer().getZone().getId().toString();
 
   public ZoneLoadedListener() {
     new MapToolEventBus().getMainEventBus().register(this);
@@ -38,6 +41,12 @@ public ZoneLoadedListener() {
   @Subscribe
   public void OnChangedMap(ZoneLoaded event) {
     ZoneRenderer currentZR = MapTool.getFrame().getCurrentZoneRenderer();
+    String oCMoutput = currentZR.getZone().getId().toString();
+    for (ZoneRenderer zr : MapTool.getFrame().getZoneRenderers()) {
+      if (Objects.equals(zr.getZone().getId().toString(), priorMapID)) {
+        oCMoutput = oCMoutput + ", " + priorMapID;
+      }
+    }
     try {
       var libs = new LibraryManager().getLegacyEventTargets(ON_CHANGE_MAP_CALLBACK).get();
       if (libs.isEmpty()) {
@@ -47,11 +56,7 @@ public void OnChangedMap(ZoneLoaded event) {
         try {
           String libraryNamespace = handler.getNamespace().get();
           EventMacroUtil.callEventHandler(
-              ON_CHANGE_MAP_CALLBACK,
-              libraryNamespace,
-              currentZR.getZone().getId().toString(),
-              null,
-              Collections.emptyMap());
+              ON_CHANGE_MAP_CALLBACK, libraryNamespace, oCMoutput, null, Collections.emptyMap());
         } catch (InterruptedException | ExecutionException e) {
           LOGGER.error(I18N.getText("library.error.notFound"), e);
           throw new AssertionError("Error retrieving library namespace");
@@ -60,5 +65,6 @@ public void OnChangedMap(ZoneLoaded event) {
     } catch (InterruptedException | ExecutionException e) {
       LOGGER.error(I18N.getText("library.error.retrievingEventHandler"), e);
     }
+    priorMapID = currentZR.getZone().getId().toString();
   }
 }