diff --git a/include/ndn-cpp/interest.hpp b/include/ndn-cpp/interest.hpp
index e55a554..8fe3119 100644
--- a/include/ndn-cpp/interest.hpp
+++ b/include/ndn-cpp/interest.hpp
@@ -136,8 +136,10 @@
    * @brief Get Interest's nonce
    *
    * If nonce was not set before this call, it will be automatically assigned to a random value
+   *
+   * Const reference needed for C decoding
    */
-  uint32_t
+  const uint32_t&
   getNonce() const;
     
   void