diff --git a/lib/include/srsran/asn1/asn1_utils.h b/lib/include/srsran/asn1/asn1_utils.h
index 8c583141d..0361359e9 100644
--- a/lib/include/srsran/asn1/asn1_utils.h
+++ b/lib/include/srsran/asn1/asn1_utils.h
@@ -142,6 +142,7 @@ public:
   int distance() const;
   int distance_bytes(uint8_t* ref_ptr) const;
   int distance_bytes() const;
+  int distance_bytes_end() const;
 
   template <class T>
   SRSASN_CODE unpack(T& val, uint32_t n_bits)
diff --git a/lib/src/asn1/asn1_utils.cc b/lib/src/asn1/asn1_utils.cc
index 2e4b81259..6433d8d7a 100644
--- a/lib/src/asn1/asn1_utils.cc
+++ b/lib/src/asn1/asn1_utils.cc
@@ -129,6 +129,11 @@ int bit_ref_impl<Ptr>::distance_bytes() const
 {
   return ((int)(ptr - start_ptr)) + ((offset) ? 1 : 0);
 }
+template <typename Ptr>
+int bit_ref_impl<Ptr>::distance_bytes_end() const
+{
+  return ((int)(max_ptr - ptr)) - ((offset) ? 1 : 0);
+}
 
 SRSASN_CODE bit_ref::pack(uint64_t val, uint32_t n_bits)
 {