diff --git a/src/core/snmp/msg_in.c b/src/core/snmp/msg_in.c
index 1e1df8cf..da9b78c1 100644
--- a/src/core/snmp/msg_in.c
+++ b/src/core/snmp/msg_in.c
@@ -1090,7 +1090,7 @@ snmp_pdu_header_check(struct pbuf *p, u16_t ofs, u16_t pdu_len, u16_t *ofs_ret,
       snmp_inc_snmpingenerrs();
       break;
     default:
-      LWIP_DEBUGF(SNMP_MSG_DEBUG, ("snmp_pdu_header_check(): unknown error_status: %d\n", m_stat->error_status));
+      LWIP_DEBUGF(SNMP_MSG_DEBUG, ("snmp_pdu_header_check(): unknown error_status: %d\n", (int)m_stat->error_status));
       break;
   }
   ofs += (1 + len_octets + len);
diff --git a/src/core/snmp/msg_out.c b/src/core/snmp/msg_out.c
index 92f588e7..ecc524c5 100644
--- a/src/core/snmp/msg_out.c
+++ b/src/core/snmp/msg_out.c
@@ -165,7 +165,7 @@ snmp_send_response(struct snmp_msg_pstat *m_stat)
         snmp_inc_snmpoutgenerrs();
         break;
       default:
-        LWIP_DEBUGF(SNMP_MSG_DEBUG, ("snmp_send_response(): unknown error_status: %d\n", m_stat->error_status));
+        LWIP_DEBUGF(SNMP_MSG_DEBUG, ("snmp_send_response(): unknown error_status: %d\n", (int)m_stat->error_status));
         break;
     }
     snmp_inc_snmpoutgetresponses();