diff --git a/app/core/src/main/java/com/fsck/k9/AccountPreferenceSerializer.kt b/app/core/src/main/java/com/fsck/k9/AccountPreferenceSerializer.kt
index f66b9e0efe77432ceb2288667e7e93767da03cf6..c84c699fa14de1f91853fc021eea799ec7105e58 100644
--- a/app/core/src/main/java/com/fsck/k9/AccountPreferenceSerializer.kt
+++ b/app/core/src/main/java/com/fsck/k9/AccountPreferenceSerializer.kt
@@ -598,7 +598,7 @@ class AccountPreferenceSerializer(
             identities = ArrayList<Identity>()
 
             val identity = Identity(
-                signatureUse = false,
+                signatureUse = true,
                 signature = resourceProvider.defaultSignature(),
                 description = resourceProvider.defaultIdentityDescription()
             )