diff --git a/dataforge-io/src/commonMain/kotlin/hep/dataforge/io/TaglessEnvelopeFormat.kt b/dataforge-io/src/commonMain/kotlin/hep/dataforge/io/TaglessEnvelopeFormat.kt
index 14d871db..c9d32c9f 100644
--- a/dataforge-io/src/commonMain/kotlin/hep/dataforge/io/TaglessEnvelopeFormat.kt
+++ b/dataforge-io/src/commonMain/kotlin/hep/dataforge/io/TaglessEnvelopeFormat.kt
@@ -43,6 +43,7 @@ class TaglessEnvelopeFormat(
             writeText(dataStart + "\r\n")
             writeFully(data.toBytes())
         }
+        flush()
     }
 
     override fun Input.readObject(): Envelope {