diff --git a/matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/crypto/attachments/MXEncryptedAttachments.kt b/matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/crypto/attachments/MXEncryptedAttachments.kt
index 68fce9462b..5672d195cc 100755
--- a/matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/crypto/attachments/MXEncryptedAttachments.kt
+++ b/matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/crypto/attachments/MXEncryptedAttachments.kt
@@ -89,7 +89,7 @@ internal object MXEncryptedAttachments {
                 key = EncryptedFileKey(
                         alg = "A256CTR",
                         ext = true,
-                        key_ops = listOf("encrypt", "decrypt"),
+                        keyOps = listOf("encrypt", "decrypt"),
                         kty = "oct",
                         k = base64ToBase64Url(Base64.encodeToString(key, Base64.DEFAULT))
                 ),
@@ -210,7 +210,7 @@ internal object MXEncryptedAttachments {
                         key = EncryptedFileKey(
                                 alg = "A256CTR",
                                 ext = true,
-                                key_ops = listOf("encrypt", "decrypt"),
+                                keyOps = listOf("encrypt", "decrypt"),
                                 kty = "oct",
                                 k = base64ToBase64Url(Base64.encodeToString(key, Base64.DEFAULT))
                         ),