diff --git a/google/cloud/spanner_v1/merged_result_set.py b/google/cloud/spanner_v1/merged_result_set.py
index 13828477b0..bfecad1e46 100644
--- a/google/cloud/spanner_v1/merged_result_set.py
+++ b/google/cloud/spanner_v1/merged_result_set.py
@@ -46,7 +46,7 @@ def run(self):
             "CloudSpanner.PartitionExecutor.run",
             observability_options=observability_options,
         ):
-            return self.__run()
+            self.__run()
 
     def __run(self):
         results = None