diff --git a/R/biting_process.R b/R/biting_process.R
index 801aea20..279802ea 100644
--- a/R/biting_process.R
+++ b/R/biting_process.R
@@ -210,9 +210,7 @@ simulate_bites <- function(
 calculate_eir <- function(species, solvers, variables, parameters, timestep) {
   a <- human_blood_meal_rate(species, variables, parameters, timestep)
   infectious <- calculate_infectious(species, solvers, variables, parameters)
-  age <- get_age(variables$birth$get_values(), timestep)
-  psi <- unique_biting_rate(age, parameters)
-  infectious * a * mean(psi)
+  infectious * a
 }
 
 effective_biting_rates <- function(a, .pi, p_bitten) {