diff --git a/src/aodv/model/aodv-routing-protocol.cc b/src/aodv/model/aodv-routing-protocol.cc
index 23a952921..bcb0df7c9 100644
--- a/src/aodv/model/aodv-routing-protocol.cc
+++ b/src/aodv/model/aodv-routing-protocol.cc
@@ -873,8 +873,11 @@ RoutingProtocol::SendRequest (Ipv4Address dst)
   ScheduleRreqRetry (dst);
   if (EnableHello)
     {
-      m_htimer.Cancel ();
-      m_htimer.Schedule (HelloInterval - Time (0.01 * MilliSeconds (UniformVariable ().GetInteger (0, 10))));
+      if (!m_htimer.IsRunning ())
+        {
+          m_htimer.Cancel ();
+          m_htimer.Schedule (HelloInterval - Time (0.01 * MilliSeconds (UniformVariable ().GetInteger (0, 10))));
+        }
     }
 }
 
@@ -1137,8 +1140,11 @@ RoutingProtocol::RecvRequest (Ptr<Packet> p, Ipv4Address receiver, Ipv4Address s
 
   if (EnableHello)
     {
-      m_htimer.Cancel ();
-      m_htimer.Schedule (HelloInterval - Time (0.1 * MilliSeconds (UniformVariable ().GetInteger (0, 10))));
+      if (!m_htimer.IsRunning ())
+        {
+          m_htimer.Cancel ();
+          m_htimer.Schedule (HelloInterval - Time (0.1 * MilliSeconds (UniformVariable ().GetInteger (0, 10))));
+	}
     }
 }