diff --git a/neo/rawio/baserawio.py b/neo/rawio/baserawio.py
index 7b5d8b768..a804f9d24 100644
--- a/neo/rawio/baserawio.py
+++ b/neo/rawio/baserawio.py
@@ -94,7 +94,7 @@
 ]
 # To be left an empty array if the concept of buffer is undefined for a reader.
 _signal_stream_dtype = [
-    ("name", "U64"),  # not necessarily unique
+    ("name", "U128"),  # not necessarily unique
     ("id", "U64"),  # must be unique
     (
         "buffer_id",