diff --git a/src/modules/siputils/checks.c b/src/modules/siputils/checks.c
index b700c620c01..ee60595e3ae 100644
--- a/src/modules/siputils/checks.c
+++ b/src/modules/siputils/checks.c
@@ -134,30 +134,17 @@ int w_has_totag(struct sip_msg* _m, char* _foo, char* _bar)
  */
 int is_uri(struct sip_msg* _m, char* _sp, char* _s2)
 {
-	pv_spec_t *sp;
-	pv_value_t pv_val;
 	sip_uri_t turi;
+	str uval;
 
-	sp = (pv_spec_t *)_sp;
-
-	if (sp && (pv_get_spec_value(_m, sp, &pv_val) == 0)) {
-		if (pv_val.flags & PV_VAL_STR) {
-			if (pv_val.rs.len == 0 || pv_val.rs.s == NULL) {
-				LM_DBG("missing argument\n");
-				return -1;
-			}
-			if(parse_uri(pv_val.rs.s, pv_val.rs.len, &turi)!=0) {
-				return -1;
-			}
-			return 1;
-		} else {
-			LM_ERR("pseudo variable value is not string\n");
-			return -1;
-		}
-	} else {
-		LM_ERR("failed to get pseudo variable value\n");
+	if(fixup_get_svalue(_m, (gparam_t*)_sp, &uval)!=0) {
+		LM_ERR("cannot get parameter value\n");
 		return -1;
 	}
+	if(parse_uri(uval.s, uval.len, &turi)!=0) {
+		return -1;
+	}
+	return 1;
 }
 
 /*
diff --git a/src/modules/siputils/siputils.c b/src/modules/siputils/siputils.c
index 50cd7425aa1..bfd90d020ad 100644
--- a/src/modules/siputils/siputils.c
+++ b/src/modules/siputils/siputils.c
@@ -137,8 +137,8 @@ static cmd_export_t cmds[]={
 		free_fixup_get_uri_param, REQUEST_ROUTE|LOCAL_ROUTE},
 	{"tel2sip", (cmd_function)tel2sip, 3, fixup_tel2sip, 0,
 		REQUEST_ROUTE|FAILURE_ROUTE|BRANCH_ROUTE|ONREPLY_ROUTE},
-	{"is_uri",            (cmd_function)is_uri,           1, fixup_pvar_null,
-		fixup_free_pvar_null, ANY_ROUTE},
+	{"is_uri",            (cmd_function)is_uri,           1, fixup_spve_null,
+		fixup_free_spve_null, ANY_ROUTE},
 	{"is_e164",            (cmd_function)is_e164,           1, fixup_pvar_null,
 		fixup_free_pvar_null, REQUEST_ROUTE|FAILURE_ROUTE|LOCAL_ROUTE},
 	{"is_uri_user_e164",   (cmd_function)w_is_uri_user_e164,  1, fixup_pvar_null,