diff --git a/electron_app/src/electron-main.js b/electron_app/src/electron-main.js
index 6e477f90..11b28258 100644
--- a/electron_app/src/electron-main.js
+++ b/electron_app/src/electron-main.js
@@ -381,6 +381,17 @@ ipcMain.on('seshat', async function(ev, payload) {
             }
             break;
 
+        case 'indexSize':
+            if (eventIndex === null) ret = 0;
+            else {
+                try {
+                    ret = await eventIndex.getSize();
+                } catch (e) {
+                    ret = 0;
+                }
+            }
+            break;
+
         default:
             mainWindow.webContents.send('seshatReply', {
                 id: payload.id,
diff --git a/src/vector/platform/ElectronPlatform.js b/src/vector/platform/ElectronPlatform.js
index 9968504a..02f2e62b 100644
--- a/src/vector/platform/ElectronPlatform.js
+++ b/src/vector/platform/ElectronPlatform.js
@@ -155,6 +155,10 @@ class SeshatIndexManager extends BaseEventIndexManager {
     async deleteEventIndex(): Promise<> {
         return this._ipcCall('deleteEventIndex');
     }
+
+    async indexSize(): Promise<> {
+        return this._ipcCall('indexSize');
+    }
 }
 
 export default class ElectronPlatform extends VectorBasePlatform {