diff --git a/CHANGELOG.md b/CHANGELOG.md
index 3576d029..908cdd4f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,6 @@
+# 1.0.0-31 - May 27, 2024
+- Fix bug in `startAnnotationToolbarItemPressedListener`
+
 # 1.0.0-30 - May 1, 2024
 - Update Android to v10.9.0
 
diff --git a/android/src/main/java/com/pdftron/pdftronflutter/helpers/PluginUtils.java b/android/src/main/java/com/pdftron/pdftronflutter/helpers/PluginUtils.java
index 75c3afc6..9ed4c8c7 100644
--- a/android/src/main/java/com/pdftron/pdftronflutter/helpers/PluginUtils.java
+++ b/android/src/main/java/com/pdftron/pdftronflutter/helpers/PluginUtils.java
@@ -4372,7 +4372,7 @@ public static void handleAnnotationCustomToolbarItemPressed(ViewerComponent comp
         String itemKey = mToolIdMap.get(itemId);
         if (itemKey != null && annotationCustomToolbarItemPressedEventSink != null) {
             // this is a custom button
-            annotationCustomToolbarItemPressedEventSink.success(itemId);
+            annotationCustomToolbarItemPressedEventSink.success(itemKey);
         }
     }
 
diff --git a/pubspec.yaml b/pubspec.yaml
index 7f91e27c..abd42876 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -1,6 +1,6 @@
 name: pdftron_flutter
 description: A convenience wrapper to build Flutter apps that use the PDFTron mobile SDK for smooth, flexible, and stand-alone document viewing.
-version: 1.0.1-30
+version: 1.0.1-31
 homepage: https://www.pdftron.com
 repository: https://github.com/PDFTron/pdftron-flutter
 issue_tracker: https://github.com/PDFTron/pdftron-flutter/issues