diff --git a/src/lte/model/lte-ue-phy.cc b/src/lte/model/lte-ue-phy.cc
index 1a87d46ef..305b1ba52 100644
--- a/src/lte/model/lte-ue-phy.cc
+++ b/src/lte/model/lte-ue-phy.cc
@@ -154,6 +154,8 @@ LteUePhy::LteUePhy (Ptr<LteSpectrumPhy> dlPhy, Ptr<LteSpectrumPhy> ulPhy)
   std::vector <int> ulRb;
   m_subChannelsForTransmissionQueue.resize (m_macChTtiDelay, ulRb);
 
+  NS_ASSERT_MSG (Simulator::Now ().GetNanoSeconds () == 0,
+                 "Cannot create UE devices after simulation started");
   Simulator::ScheduleNow (&LteUePhy::SubframeIndication, this, 1, 1);
 }