diff --git a/tools/profiling/microbenchmarks/bm_json.py b/tools/profiling/microbenchmarks/bm_json.py
index e885444f410..917269823d0 100644
--- a/tools/profiling/microbenchmarks/bm_json.py
+++ b/tools/profiling/microbenchmarks/bm_json.py
@@ -203,4 +203,5 @@ def expand_json(js, js2 = None):
           row['real_time'] = bm2['real_time']
           row['iterations'] = bm2['iterations']
           bm2['already_used'] = True
+          break
     yield row