diff --git a/modules_k/registrar/common.c b/modules_k/registrar/common.c
index 824b635..baf09fb 100644
--- a/modules_k/registrar/common.c
+++ b/modules_k/registrar/common.c
@@ -99,8 +99,8 @@ int extract_aor(str* _uri, str* _a)
 		if (user_len)
 			aor_buf[_a->len++] = '@';
 		/* strip prefix (if defined) */
-		realm_prefix.s = cfg_get(registrar, registrar_cfg, realm_pref);
-		realm_prefix.len = strlen(realm_prefix.s);
+		realm_prefix.s = cfg_get(registrar, registrar_cfg, realm_pref).s;
+		realm_prefix.len = cfg_get(registrar, registrar_cfg, realm_pref).len;
 		if (realm_prefix.len && realm_prefix.len<puri.host.len &&
 		(memcmp(realm_prefix.s, puri.host.s, realm_prefix.len)==0) ) {
 			memcpy(aor_buf + _a->len, puri.host.s + realm_prefix.len,
diff --git a/modules_k/registrar/config.c b/modules_k/registrar/config.c
index f187c1a..038a68c 100644
--- a/modules_k/registrar/config.c
+++ b/modules_k/registrar/config.c
@@ -40,7 +40,7 @@ struct cfg_group_registrar	default_registrar_cfg = {
 		0,	/* case_sensitive */
 		Q_UNSPECIFIED,	/* default_q */
 		1,	/* append_branches */
-		""	/* realm_pref */
+		STR_NULL	/* realm_pref */
 	    };
 
 void	*registrar_cfg = &default_registrar_cfg;
@@ -64,7 +64,7 @@ cfg_def_t	registrar_cfg_def[] = {
 		"The parameter represents default q value for new contacts."}, /* Q_UNSPECIFIED is -1 */
 	{"append_branches",	CFG_VAR_INT ,			0, 0, 0, 0,
 		"If set to 1(default), lookup will put all contacts found in msg structure"},
-	{"realm_pref",		CFG_VAR_STRING ,			0, 0, 0, 0,
+	{"realm_pref",		CFG_VAR_STR,			0, 0, 0, 0,
 		"Realm prefix to be removed. Default is \"\""},
 	{0, 0, 0, 0, 0, 0}
 };
diff --git a/modules_k/registrar/config.h b/modules_k/registrar/config.h
index 06b1390..f2708d6 100644
--- a/modules_k/registrar/config.h
+++ b/modules_k/registrar/config.h
@@ -36,7 +36,7 @@ struct cfg_group_registrar {
 	unsigned int	case_sensitive;
 	qvalue_t	default_q;
 	unsigned int	append_branches;
-	char* 		realm_pref;
+	str 		realm_pref;
 };
 
 extern struct cfg_group_registrar	default_registrar_cfg;
diff --git a/modules_k/registrar/reg_mod.c b/modules_k/registrar/reg_mod.c
index e8089db..4626db5 100644
--- a/modules_k/registrar/reg_mod.c
+++ b/modules_k/registrar/reg_mod.c
@@ -189,7 +189,7 @@ static param_export_t params[] = {
 	{"append_branches",    INT_PARAM, &default_registrar_cfg.append_branches		},
 	{"case_sensitive",     INT_PARAM, &default_registrar_cfg.case_sensitive			},
 	/*	{"tcp_persistent_flag",INT_PARAM, &tcp_persistent_flag }, */
-	{"realm_prefix",       STR_PARAM, &default_registrar_cfg.realm_pref          		},
+	{"realm_prefix",       PARAM_STR, &default_registrar_cfg.realm_pref          		},
 	{"min_expires",        INT_PARAM, &default_registrar_cfg.min_expires			},
 	{"max_expires",        INT_PARAM, &default_registrar_cfg.max_expires			},
 	{"received_param",     STR_PARAM, &rcv_param           					},