diff --git a/libsignal-service/src/main/java/org/whispersystems/signalservice/api/attachment/AttachmentApi.kt b/libsignal-service/src/main/java/org/whispersystems/signalservice/api/attachment/AttachmentApi.kt
index a6b3279339..4436bd3844 100644
--- a/libsignal-service/src/main/java/org/whispersystems/signalservice/api/attachment/AttachmentApi.kt
+++ b/libsignal-service/src/main/java/org/whispersystems/signalservice/api/attachment/AttachmentApi.kt
@@ -107,7 +107,7 @@ class AttachmentApi(
         incrementalDigest = digestInfo.incrementalDigest,
         incrementalDigestChunkSize = digestInfo.incrementalMacChunkSize,
         uploadTimestamp = attachmentStream.uploadTimestamp,
-        dataSize = attachmentData.dataSize
+        dataSize = attachmentStream.length
       )
     }
   }