diff --git a/apps/snmp/snmp_handler.c b/apps/snmp/snmp_handler.c
index 3e948fd9..5914efe7 100644
--- a/apps/snmp/snmp_handler.c
+++ b/apps/snmp/snmp_handler.c
@@ -253,7 +253,7 @@ snmp_scalar_get(clicon_handle               h,
 	netsnmp_set_request_error(reqinfo, requests, SNMP_NOSUCHINSTANCE);
 	goto ok;
     }
-    if (type_yang2asn1(ys, &asn1type) < 0)
+    if (type_yang2asn1(ys, &asn1type, 1) < 0)
 	goto done;
     if ((ret = type_snmpstr2val(snmpstr, &asn1type, &snmpval, &snmplen, &reason)) < 0)
 	goto done;
@@ -383,7 +383,7 @@ clixon_snmp_scalar_handler(netsnmp_mib_handler          *handler,
 	break;
     case MODE_SET_RESERVE1: /* 0 */
 	/* Translate from YANG ys leaf type to SNMP asn1.1 type ids (not value), also cvtype */
-	if (type_yang2asn1(ys, &asn1_type) < 0)
+	if (type_yang2asn1(ys, &asn1_type, 0) < 0)
 	    goto done;
         if (requestvb->type != asn1_type){
 	    clicon_debug(1, "%s Expected type:%d, got: %d", __FUNCTION__, requestvb->type, asn1_type);
diff --git a/apps/snmp/snmp_lib.c b/apps/snmp/snmp_lib.c
index 8aaec720..fbc9f83f 100644
--- a/apps/snmp/snmp_lib.c
+++ b/apps/snmp/snmp_lib.c
@@ -154,6 +154,7 @@ snmp_handle_free(clixon_snmp_handle *sh)
  *
  * @param[in]    ys         YANG leaf node
  * @param[out]   asn1_type  ASN.1 type id
+ * @param[in]    extended   Special case clixon extended types used in xml<->asn1 data conversions
  * @retval   0   OK
  * @retval   -1  Error
  * @see type_yang2snmp, yang only
@@ -162,7 +163,8 @@ snmp_handle_free(clixon_snmp_handle *sh)
  */
 int
 type_yang2asn1(yang_stmt    *ys,
-	       int          *asn1_type)
+	       int          *asn1_type,
+	       int           extended)
 {
     int        retval = -1;
     yang_stmt *yrestype;  /* resolved type */
@@ -201,10 +203,10 @@ type_yang2asn1(yang_stmt    *ys,
     else if (strcmp(origtype, "timeticks")==0){
 	at = ASN_TIMETICKS; /* Clixon extended string type */
     }
-    else if (strcmp(origtype, "phys-address")==0){
+    else if (extended && strcmp(origtype, "phys-address")==0){
 	at = CLIXON_ASN_PHYS_ADDR; /* Clixon extended string type */
     }
-    else if (strcmp(origtype, "SnmpAdminString")==0){
+    else if (extended && strcmp(origtype, "SnmpAdminString")==0){
 	at = CLIXON_ASN_ADMIN_STRING; /* cf extension display-type 255T? */
     }
 
diff --git a/apps/snmp/snmp_lib.h b/apps/snmp/snmp_lib.h
index d0f4fbef..5c02cccd 100644
--- a/apps/snmp/snmp_lib.h
+++ b/apps/snmp/snmp_lib.h
@@ -61,7 +61,7 @@ typedef struct clixon_snmp_handle clixon_snmp_handle;
 int   snmp_access_str2int(char *modes_str);
 const char *snmp_msg_int2str(int msg);
 int   snmp_handle_free(clixon_snmp_handle *sh);
-int   type_yang2asn1(yang_stmt *ys, int *asn1_type);
+int   type_yang2asn1(yang_stmt *ys, int *asn1_type, int extended);
 int   type_snmp2xml(yang_stmt                  *ys,
 		    netsnmp_variable_list      *requestvb,
 		    netsnmp_agent_request_info *reqinfo,
diff --git a/apps/snmp/snmp_register.c b/apps/snmp/snmp_register.c
index cfbc933f..a3409c01 100644
--- a/apps/snmp/snmp_register.c
+++ b/apps/snmp/snmp_register.c
@@ -136,7 +136,7 @@ mib_yang_leaf(clicon_handle h,
     if (yang_extension_value(ys, "max-access", IETF_YANG_SMIV2_NS, NULL, &modes_str) < 0)
 	goto done;
     /* Sanity check of types */
-    if (type_yang2asn1(ys, NULL) < 0)
+    if (type_yang2asn1(ys, NULL, 0) < 0)
 	goto done;
 
     /* Get modes (access) read-only, read-write, not-accessible, accessible-for-notify
@@ -292,7 +292,7 @@ mib_yang_table(clicon_handle h,
 		       yang_argument_get(ylist), keyname);
 	    goto done;
 	}
-	if (type_yang2asn1(yleaf, &asn1type) < 0)
+	if (type_yang2asn1(yleaf, &asn1type, 0) < 0)
 	    //	    goto done;
 	    goto ok; // XXX skip
 	if (snmp_varlist_add_variable(&table_info->indexes,