diff --git a/src/main/java/eu/siacs/conversations/entities/DownloadableFile.java b/src/main/java/eu/siacs/conversations/entities/DownloadableFile.java
index 8e35a9a68..c88af6f95 100644
--- a/src/main/java/eu/siacs/conversations/entities/DownloadableFile.java
+++ b/src/main/java/eu/siacs/conversations/entities/DownloadableFile.java
@@ -63,6 +63,7 @@ public class DownloadableFile extends File {
 			System.arraycopy(keyIvCombo, 12, this.aeskey, 0, 32);
 		} else if (keyIvCombo.length >= 32) {
 			this.aeskey = new byte[32];
+			this.iv = new byte[]{ 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0xf };
 			System.arraycopy(keyIvCombo, 0, aeskey, 0, 32);
 		}
 	}