diff --git a/res/snmp/agent.c b/res/snmp/agent.c
index 7ff78d56e3e7b066219f9e5d5ad429435e4d1273..b8fcb07f6b04fec299a30f2ada3d1f8abe067d47 100644
--- a/res/snmp/agent.c
+++ b/res/snmp/agent.c
@@ -63,6 +63,10 @@
 #include <net-snmp/net-snmp-includes.h>
 #include <net-snmp/agent/net-snmp-agent-includes.h>
 
+#if !defined(RONLY) && defined(NETSNMP_OLDAPI_RONLY)
+#define RONLY NETSNMP_OLDAPI_RONLY
+#endif
+
 #include "asterisk/paths.h"	/* need ast_config_AST_SOCKET */
 #include "asterisk/channel.h"
 #include "asterisk/logger.h"