diff --git a/src/wifi/test/spectrum-wifi-phy-test.cc b/src/wifi/test/spectrum-wifi-phy-test.cc
index 10ac16584..9091572e1 100644
--- a/src/wifi/test/spectrum-wifi-phy-test.cc
+++ b/src/wifi/test/spectrum-wifi-phy-test.cc
@@ -1396,7 +1396,8 @@ SpectrumWifiPhyMultipleInterfacesTest::DoRun()
         }
     }
 
-    Simulator::Stop(Seconds(30));
+    delay += Seconds(1);
+    Simulator::Stop(delay);
     Simulator::Run();
 }