diff --git a/src/connector/codec/src/decoder/protobuf/parser.rs b/src/connector/codec/src/decoder/protobuf/parser.rs
index 3e6edebf0d899..3464797877ace 100644
--- a/src/connector/codec/src/decoder/protobuf/parser.rs
+++ b/src/connector/codec/src/decoder/protobuf/parser.rs
@@ -209,7 +209,7 @@ pub fn from_protobuf_value<'a>(
                     &key.clone().into(),
                     map_type.key(),
                 )?);
-                value_builder.append(from_protobuf_value(field_desc, &value, map_type.value())?);
+                value_builder.append(from_protobuf_value(field_desc, value, map_type.value())?);
             }
             let keys = key_builder.finish();
             let values = value_builder.finish();