diff --git a/pkg/dds/lib/src/devtools/client.dart b/pkg/dds/lib/src/devtools/client.dart
index ae04ad231b5..c8543d24254 100644
--- a/pkg/dds/lib/src/devtools/client.dart
+++ b/pkg/dds/lib/src/devtools/client.dart
@@ -186,7 +186,7 @@ class DevToolsClient {
         print('DevTools SSE request: $e');
         return e;
       });
-      sink = LoggingMiddlewareSink(sink);
+      sink = LoggingMiddlewareSink<String>(sink);
     }
 
     _devToolsPeer = json_rpc.Peer(