diff --git a/matrix-sdk-android/src/main/java/im/vector/matrix/android/api/session/room/model/call/CallHangupContent.kt b/matrix-sdk-android/src/main/java/im/vector/matrix/android/api/session/room/model/call/CallHangupContent.kt
index 1e50bc247e..1cb379b508 100644
--- a/matrix-sdk-android/src/main/java/im/vector/matrix/android/api/session/room/model/call/CallHangupContent.kt
+++ b/matrix-sdk-android/src/main/java/im/vector/matrix/android/api/session/room/model/call/CallHangupContent.kt
@@ -40,6 +40,7 @@ data class CallHangupContent(
          */
         @Json(name = "reason") val reason: Reason? = null
 ) {
+    @JsonClass(generateAdapter = false)
     enum class Reason {
         @Json(name = "ice_failed")
         ICE_FAILED,
diff --git a/matrix-sdk-android/src/main/java/im/vector/matrix/android/api/session/room/model/call/SdpType.kt b/matrix-sdk-android/src/main/java/im/vector/matrix/android/api/session/room/model/call/SdpType.kt
index 17c6d9a89f..799792c8a3 100644
--- a/matrix-sdk-android/src/main/java/im/vector/matrix/android/api/session/room/model/call/SdpType.kt
+++ b/matrix-sdk-android/src/main/java/im/vector/matrix/android/api/session/room/model/call/SdpType.kt
@@ -17,7 +17,9 @@
 package im.vector.matrix.android.api.session.room.model.call
 
 import com.squareup.moshi.Json
+import com.squareup.moshi.JsonClass
 
+@JsonClass(generateAdapter = false)
 enum class SdpType {
     @Json(name = "offer")
     OFFER,