diff --git a/src/main/java/eu/siacs/conversations/Config.java b/src/main/java/eu/siacs/conversations/Config.java
index 294e62539..e131a4a32 100644
--- a/src/main/java/eu/siacs/conversations/Config.java
+++ b/src/main/java/eu/siacs/conversations/Config.java
@@ -100,7 +100,7 @@ public final class Config {
     public static final boolean REMOVE_BROKEN_DEVICES = false;
     public static final boolean OMEMO_PADDING = false;
     public static final boolean PUT_AUTH_TAG_INTO_KEY = true;
-    public static final boolean TWELVE_BYTE_IV = true;
+    public static final boolean TWELVE_BYTE_IV = false;
 
     public static final boolean USE_BOOKMARKS2 = false;