diff --git a/rust/src/dcerpc/dcerpc.rs b/rust/src/dcerpc/dcerpc.rs
index 45b68a66d0..f91db9831c 100644
--- a/rust/src/dcerpc/dcerpc.rs
+++ b/rust/src/dcerpc/dcerpc.rs
@@ -21,6 +21,7 @@ use crate::dcerpc::parser;
 use nom::error::ErrorKind;
 use nom::number::Endianness;
 use nom;
+use std;
 use std::cmp;
 use std::ffi::CString;
 
@@ -1375,10 +1376,9 @@ pub const PARSER_NAME: &'static [u8] = b"dcerpc\0";
 
 #[no_mangle]
 pub unsafe extern "C" fn rs_dcerpc_register_parser() {
-    let default_port = CString::new("[0:65355]").unwrap();
     let parser = RustParser {
         name: PARSER_NAME.as_ptr() as *const std::os::raw::c_char,
-        default_port: default_port.as_ptr(),
+        default_port: std::ptr::null(),
         ipproto: IPPROTO_TCP,
         probe_ts: None,
         probe_tc: None,
diff --git a/rust/src/dcerpc/dcerpc_udp.rs b/rust/src/dcerpc/dcerpc_udp.rs
index 42184d44bd..b71dfe18d2 100644
--- a/rust/src/dcerpc/dcerpc_udp.rs
+++ b/rust/src/dcerpc/dcerpc_udp.rs
@@ -341,10 +341,9 @@ fn register_pattern_probe() -> i8 {
 
 #[no_mangle]
 pub unsafe extern "C" fn rs_dcerpc_udp_register_parser() {
-    let default_port = CString::new("[0:65535]").unwrap();
     let parser = RustParser {
         name: PARSER_NAME.as_ptr() as *const std::os::raw::c_char,
-        default_port: default_port.as_ptr(),
+        default_port: std::ptr::null(),
         ipproto: core::IPPROTO_UDP,
         probe_ts: None,
         probe_tc: None,