diff --git a/src/MongoDB.Driver/PipelineDefinition.cs b/src/MongoDB.Driver/PipelineDefinition.cs
index 59b17f688bc..682bd6c8e77 100644
--- a/src/MongoDB.Driver/PipelineDefinition.cs
+++ b/src/MongoDB.Driver/PipelineDefinition.cs
@@ -355,6 +355,7 @@ private static List<IPipelineStageDefinition> VerifyStages(List<IPipelineStageDe
 
             return stages;
         }
+    }
 
     internal class OptimizingPipelineDefinition<TInput, TOutput> : PipelineDefinition<TInput, TOutput>
     {