diff --git a/cpp/models/abm/person.cpp b/cpp/models/abm/person.cpp
index 5f20ed5e8f..87cc2a838f 100755
--- a/cpp/models/abm/person.cpp
+++ b/cpp/models/abm/person.cpp
@@ -208,7 +208,7 @@ PersonId Person::get_id() const
     return m_person_id;
 }
 
-const uint64_t Person::get_unique_id() const
+uint64_t Person::get_unique_id() const
 {
     return m_unique_id;
 }
diff --git a/cpp/models/abm/person.h b/cpp/models/abm/person.h
index a9a17ec05a..622ca98cdf 100755
--- a/cpp/models/abm/person.h
+++ b/cpp/models/abm/person.h
@@ -295,7 +295,7 @@ class Person
      * This id is only relevant for the graph abm and otherwise corresponds to the PersonId.
      * @return The unique id.
      */
-    const uint64_t get_unique_id() const;
+    uint64_t get_unique_id() const;
 
     /**
     * @brief Set the PersonId of the Person.