diff --git a/matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/auth/AuthModule.kt b/matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/auth/AuthModule.kt
index 8e7c6398..5a49c512 100644
--- a/matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/auth/AuthModule.kt
+++ b/matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/auth/AuthModule.kt
@@ -18,6 +18,7 @@ package im.vector.matrix.android.internal.auth
 
 import android.content.Context
 import im.vector.matrix.android.api.auth.Authenticator
+import im.vector.matrix.android.internal.auth.db.AuthRealmModule
 import im.vector.matrix.android.internal.auth.db.RealmSessionParamsStore
 import im.vector.matrix.android.internal.auth.db.SessionParamsMapper
 import io.realm.RealmConfiguration
@@ -43,6 +44,7 @@ class AuthModule {
             val mapper = SessionParamsMapper((get()))
             val realmConfiguration = RealmConfiguration.Builder()
                     .name("matrix-sdk-auth.realm")
+                    .modules(AuthRealmModule())
                     .deleteRealmIfMigrationNeeded()
                     .build()
             RealmSessionParamsStore(mapper, realmConfiguration) as SessionParamsStore
diff --git a/matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/auth/db/AuthRealmModule.kt b/matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/auth/db/AuthRealmModule.kt
new file mode 100644
index 00000000..dcc03935
--- /dev/null
+++ b/matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/auth/db/AuthRealmModule.kt
@@ -0,0 +1,28 @@
+/*
+ * Copyright 2019 New Vector Ltd
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package im.vector.matrix.android.internal.auth.db
+
+import io.realm.annotations.RealmModule
+
+/**
+ * Realm module for authentication classes
+ */
+@RealmModule(library = true,
+        classes = [
+            SessionParamsEntity::class
+        ])
+internal class AuthRealmModule
diff --git a/matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/database/model/SessionRealmModule.kt b/matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/database/model/SessionRealmModule.kt
new file mode 100644
index 00000000..a5042634
--- /dev/null
+++ b/matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/database/model/SessionRealmModule.kt
@@ -0,0 +1,38 @@
+/*
+ * Copyright 2019 New Vector Ltd
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package im.vector.matrix.android.internal.database.model
+
+import io.realm.annotations.RealmModule
+
+/**
+ * Realm module for Session
+ */
+@RealmModule(library = true,
+        classes = [
+            ChunkEntity::class,
+            EventEntity::class,
+            FilterEntity::class,
+            GroupEntity::class,
+            GroupSummaryEntity::class,
+            ReadReceiptEntity::class,
+            RoomEntity::class,
+            RoomSummaryEntity::class,
+            RoomTagEntity::class,
+            SyncEntity::class,
+            UserEntity::class
+        ])
+internal class SessionRealmModule
diff --git a/matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/session/SessionModule.kt b/matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/session/SessionModule.kt
index 330c53bd..43e0b8a7 100644
--- a/matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/session/SessionModule.kt
+++ b/matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/session/SessionModule.kt
@@ -25,6 +25,7 @@ import im.vector.matrix.android.api.session.signout.SignOutService
 import im.vector.matrix.android.api.session.sync.FilterService
 import im.vector.matrix.android.api.session.user.UserService
 import im.vector.matrix.android.internal.database.LiveEntityObserver
+import im.vector.matrix.android.internal.database.model.SessionRealmModule
 import im.vector.matrix.android.internal.session.filter.*
 import im.vector.matrix.android.internal.session.group.DefaultGroupService
 import im.vector.matrix.android.internal.session.group.GroupSummaryUpdater
@@ -63,6 +64,7 @@ internal class SessionModule(private val sessionParams: SessionParams) {
             RealmConfiguration.Builder()
                     .directory(directory)
                     .name("disk_store.realm")
+                    .modules(SessionRealmModule())
                     .deleteRealmIfMigrationNeeded()
                     .build()
         }