diff --git a/src/core/snmp/asn1_enc.c b/src/core/snmp/asn1_enc.c
index 0c3ead94..e8ffaf2f 100644
--- a/src/core/snmp/asn1_enc.c
+++ b/src/core/snmp/asn1_enc.c
@@ -139,7 +139,7 @@ snmp_asn1_enc_s32t_cnt(s32_t value, u16_t *octets_needed)
  * @param octets_needed points to the return value
  */
 void
-snmp_asn1_enc_oid_cnt(u8_t ident_len, const s32_t *ident, u16_t *octets_needed)
+snmp_asn1_enc_oid_cnt(u16_t ident_len, const s32_t *ident, u16_t *octets_needed)
 {
   s32_t sub_id;
   u8_t cnt;
@@ -435,7 +435,7 @@ snmp_asn1_enc_s32t(struct pbuf *p, u16_t ofs, u16_t octets_needed, s32_t value)
  * @return ERR_OK if successful, ERR_ARG if we can't (or won't) encode
  */
 err_t
-snmp_asn1_enc_oid(struct pbuf *p, u16_t ofs, u8_t ident_len, const s32_t *ident)
+snmp_asn1_enc_oid(struct pbuf *p, u16_t ofs, u16_t ident_len, const s32_t *ident)
 {
   u16_t plen, base;
   u8_t *msg_ptr;
diff --git a/src/include/lwip/snmp_asn1.h b/src/include/lwip/snmp_asn1.h
index 147f5db9..820d6f6e 100644
--- a/src/include/lwip/snmp_asn1.h
+++ b/src/include/lwip/snmp_asn1.h
@@ -84,12 +84,12 @@ err_t snmp_asn1_dec_raw(struct pbuf *p, u16_t ofs, u16_t len, u16_t raw_len, u8_
 void snmp_asn1_enc_length_cnt(u16_t length, u8_t *octets_needed);
 void snmp_asn1_enc_u32t_cnt(u32_t value, u16_t *octets_needed);
 void snmp_asn1_enc_s32t_cnt(s32_t value, u16_t *octets_needed);
-void snmp_asn1_enc_oid_cnt(u8_t ident_len, const s32_t *ident, u16_t *octets_needed);
+void snmp_asn1_enc_oid_cnt(u16_t ident_len, const s32_t *ident, u16_t *octets_needed);
 err_t snmp_asn1_enc_type(struct pbuf *p, u16_t ofs, u8_t type);
 err_t snmp_asn1_enc_length(struct pbuf *p, u16_t ofs, u16_t length);
 err_t snmp_asn1_enc_u32t(struct pbuf *p, u16_t ofs, u16_t octets_needed, u32_t value);
 err_t snmp_asn1_enc_s32t(struct pbuf *p, u16_t ofs, u16_t octets_needed, s32_t value);
-err_t snmp_asn1_enc_oid(struct pbuf *p, u16_t ofs, u8_t ident_len, const s32_t *ident);
+err_t snmp_asn1_enc_oid(struct pbuf *p, u16_t ofs, u16_t ident_len, const s32_t *ident);
 err_t snmp_asn1_enc_raw(struct pbuf *p, u16_t ofs, u16_t raw_len, const u8_t *raw);
 
 #ifdef __cplusplus
diff --git a/src/include/lwip/snmp_msg.h b/src/include/lwip/snmp_msg.h
index cafd5d45..b4e9283f 100644
--- a/src/include/lwip/snmp_msg.h
+++ b/src/include/lwip/snmp_msg.h
@@ -90,7 +90,7 @@ struct snmp_varbind
 
   /* object value ASN1 type */
   u8_t value_type;
-  /* object value length (in u8_t) */
+  /* object value length */
   u16_t value_len;
   /* object value */
   void *value;