diff --git a/src/cosim/execution.cpp b/src/cosim/execution.cpp
index 0eafe34f..71dbd623 100644
--- a/src/cosim/execution.cpp
+++ b/src/cosim/execution.cpp
@@ -152,7 +152,9 @@ class execution::impl
                 stepSize = step();
                 timer_.sleep(currentTime_);
             } while (!stopped_ && !timed_out(endTime, currentTime_, stepSize));
-            return !stopped_;
+            bool isStopped = stopped_;
+            stopped_ = true;
+            return !isStopped;
         });
     }