diff --git a/gio/gdbusmessage.c b/gio/gdbusmessage.c
index cbd9e087c..0b803bc30 100644
--- a/gio/gdbusmessage.c
+++ b/gio/gdbusmessage.c
@@ -2168,7 +2168,6 @@ g_dbus_message_new_from_blob (guchar                *blob,
 
   g_return_val_if_fail (blob != NULL, NULL);
   g_return_val_if_fail (error == NULL || *error == NULL, NULL);
-  g_return_val_if_fail (blob_len >= 12, NULL);
 
   message = g_dbus_message_new ();
 
diff --git a/gio/tests/gdbus-serialization.c b/gio/tests/gdbus-serialization.c
index df1c63ca2..4f0634cf1 100644
--- a/gio/tests/gdbus-serialization.c
+++ b/gio/tests/gdbus-serialization.c
@@ -1512,10 +1512,8 @@ test_message_parse_truncated (void)
 
   g_clear_object (&message);
 
-  /* 12 bytes is the minimum size of the D-Bus message header. Anything less
-   * than that is rejected as a programming error by
-   * g_dbus_message_new_from_blob(). */
-  for (gsize i = 12; i < size; i++)
+  /* Try parsing all possible prefixes of the full @blob. */
+  for (gsize i = 0; i < size; i++)
     {
       message2 = g_dbus_message_new_from_blob (blob, i, G_DBUS_CAPABILITY_FLAGS_NONE, &error);
       g_assert_error (error, G_IO_ERROR, G_IO_ERROR_INVALID_ARGUMENT);