diff --git a/changelog.d/8340.misc b/changelog.d/8340.misc
new file mode 100644
index 0000000000..52556b5b42
--- /dev/null
+++ b/changelog.d/8340.misc
@@ -0,0 +1 @@
+Analytics: add crypto module to E2E events
diff --git a/vector/src/main/java/im/vector/app/core/di/ActiveSessionHolder.kt b/vector/src/main/java/im/vector/app/core/di/ActiveSessionHolder.kt
index f3d775b39f..472d0896f9 100644
--- a/vector/src/main/java/im/vector/app/core/di/ActiveSessionHolder.kt
+++ b/vector/src/main/java/im/vector/app/core/di/ActiveSessionHolder.kt
@@ -22,6 +22,8 @@ import im.vector.app.core.dispatchers.CoroutineDispatchers
 import im.vector.app.core.pushers.UnregisterUnifiedPushUseCase
 import im.vector.app.core.services.GuardServiceStarter
 import im.vector.app.core.session.ConfigureAndStartSessionUseCase
+import im.vector.app.features.analytics.DecryptionFailureTracker
+import im.vector.app.features.analytics.plan.Error
 import im.vector.app.features.call.webrtc.WebRtcCallManager
 import im.vector.app.features.crypto.keysrequest.KeyRequestHandler
 import im.vector.app.features.crypto.verification.IncomingVerificationRequestHandler
@@ -56,6 +58,7 @@ class ActiveSessionHolder @Inject constructor(
         private val unregisterUnifiedPushUseCase: UnregisterUnifiedPushUseCase,
         private val applicationCoroutineScope: CoroutineScope,
         private val coroutineDispatchers: CoroutineDispatchers,
+        private val decryptionFailureTracker: DecryptionFailureTracker,
 ) {
 
     private var activeSessionReference: AtomicReference<Session?> = AtomicReference()
@@ -72,6 +75,11 @@ class ActiveSessionHolder @Inject constructor(
         session.callSignalingService().addCallListener(callManager)
         imageManager.onSessionStarted(session)
         guardServiceStarter.start()
+        decryptionFailureTracker.currentModule = if (session.cryptoService().name() == "rust-sdk") {
+            Error.CryptoModule.Rust
+        } else {
+            Error.CryptoModule.Native
+        }
     }
 
     suspend fun clearActiveSession() {
diff --git a/vector/src/main/java/im/vector/app/features/analytics/DecryptionFailureTracker.kt b/vector/src/main/java/im/vector/app/features/analytics/DecryptionFailureTracker.kt
index 90a4a3213c..d596741d53 100644
--- a/vector/src/main/java/im/vector/app/features/analytics/DecryptionFailureTracker.kt
+++ b/vector/src/main/java/im/vector/app/features/analytics/DecryptionFailureTracker.kt
@@ -58,6 +58,8 @@ class DecryptionFailureTracker @Inject constructor(
     private val failures = mutableListOf<DecryptionFailure>()
     private val alreadyReported = mutableListOf<String>()
 
+    var currentModule: Error.CryptoModule? = null
+
     init {
         start()
     }
@@ -137,7 +139,12 @@ class DecryptionFailureTracker @Inject constructor(
                     // for now we ignore events already reported even if displayed again?
                     .filter { alreadyReported.contains(it).not() }
                     .forEach { failedEventId ->
-                        analyticsTracker.capture(Error(context = aggregation.key.first, domain = Error.Domain.E2EE, name = aggregation.key.second))
+                        analyticsTracker.capture(Error(
+                                context = aggregation.key.first,
+                                domain = Error.Domain.E2EE,
+                                name = aggregation.key.second,
+                                cryptoModule = currentModule
+                        ))
                         alreadyReported.add(failedEventId)
                     }
         }