diff --git a/src/internal/mana_lib.hpp b/src/internal/mana_lib.hpp
index c080e59..957df05 100644
--- a/src/internal/mana_lib.hpp
+++ b/src/internal/mana_lib.hpp
@@ -180,9 +180,10 @@ class ManaSinkPerfProxy: public IManaSink
         perf_.dt_processEvent.clear();
         perf_.t_endRun = {};
 
-        perf_.t_beginRun = Perf::clock::now();
+        auto t = Perf::clock::now();
         sink_->begin_run(descriptor_json);
-        perf_.dt_beginRun = Perf::duration_cast(Perf::clock::now() - perf_.t_beginRun);
+        perf_.t_beginRun = Perf::clock::now();
+        perf_.dt_beginRun = Perf::duration_cast(Perf::clock::now() - t);
     }
 
     void end_run(const char *descriptor_json) override