diff --git a/inst/include/population_dynamics/population/population.hpp b/inst/include/population_dynamics/population/population.hpp
index aec36ba1..bc5a9205 100644
--- a/inst/include/population_dynamics/population/population.hpp
+++ b/inst/include/population_dynamics/population/population.hpp
@@ -541,10 +541,11 @@ struct Population : public fims_model_object::FIMSObject<Type> {
       POPULATION_LOG << " age-length transition matrix" << std::endl;
       for(size_t a = 0; a < this->nages; a++){
         for(size_t l = 0; l < this->nlengths; l++){
-          this->fleets[fleet_]->age_length_transition_matrix[i_age_length] = this->growth->evaluate(ages[a]);
+          this->fleets[fleet_]->age_length_transition_matrix[i_age_length] = this->growth->alk(ages[a]);
         }
     }
   }
+  }
 
   /**
    * @brief Calculates expected proportion of individuals mature at a selected