diff --git a/ChangeLog b/ChangeLog
index 0723f72..8f7c24d 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+2017-01-30  Wolfgang Lux  <wolfgang.lux@gmail.com>
+
+	* EcAlarmSinkSNMP.m (pollHeartBeat_handler): Don't use memdup,
+	which is replaced by netsnmp_memdup with a different interface in
+	net-snmp 5.7.3.
+
 2016-07-20  Wolfgang Lux  <wolfgang.lux@gmail.com>
 
 	* EcConsole.m (-ecRun): Pass distantFuture to -runMode:beforeDate:
diff --git a/EcAlarmSinkSNMP.m b/EcAlarmSinkSNMP.m
index df8b118..f9969c7 100644
--- a/EcAlarmSinkSNMP.m
+++ b/EcAlarmSinkSNMP.m
@@ -773,8 +773,8 @@ pollHeartBeat_handler(netsnmp_mib_handler *handler,
 	/*
 	 * store old info for undo later 
 	 */
-	memdup((u_char**)&pollHeartBeat_cache,
-	  (u_char*)&pollHeartBeat, sizeof(pollHeartBeat));
+        pollHeartBeat_cache = malloc(sizeof(pollHeartBeat));
+        memcpy(&pollHeartBeat_cache, &pollHeartBeat, sizeof(pollHeartBeat));
 	if (pollHeartBeat_cache == NULL)
 	  {
 	    netsnmp_set_request_error(reqinfo, requests,