diff --git a/R/compute.R b/R/compute.R
index 70074fe..241fe1c 100644
--- a/R/compute.R
+++ b/R/compute.R
@@ -1385,7 +1385,7 @@ compute_exposure_predictions <- function(
 
   if (!rlang::is_empty(cmaxes)) {
     new_conc <- c(prediction_df$conc, cmaxes)
-    prediction_df <- tibble::tibble(conc = sort(unique(new_conc)))
+    prediction_df <- tibble::tibble(conc = sort(new_conc))
   }
 
   ########## SHOULD THIS BE ITS OWN FUNCTION? ############
diff --git a/tests/testthat/test-compute_exposure_predictions.R b/tests/testthat/test-compute_exposure_predictions.R
index 04d86a9..a407742 100644
--- a/tests/testthat/test-compute_exposure_predictions.R
+++ b/tests/testthat/test-compute_exposure_predictions.R
@@ -32,42 +32,3 @@ test_that('compute_exposure_predictions runs fine for good model and full data',
     )
   )
 })
-
-
-test_that('compute_exposure_predictions does not add non-unique conc values with cmaxes', {
-  data_proc <- preprocess(cqtkit_data_dofetilide)
-  mod <- fit_prespecified_model(
-    data_proc,
-    deltaQTCF,
-    ID,
-    CONC,
-    deltaQTCFBL,
-    TRTG,
-    TAFD,
-    method = "ML",
-    remove_conc_iiv = TRUE
-  )
-
-  expo_pred <- compute_exposure_predictions(
-    data_proc,
-    mod,
-    CONC,
-    treatment_predictors = list(
-      CONC = 10,
-      deltaQTCFBL = 0,
-      TRTG = "Dofetilide",
-      TAFD = "1 HR"
-    ),
-    control_predictors = list(
-      CONC = 0,
-      deltaQTCFBL = 0,
-      TRTG = "Placebo",
-      TAFD = "1 HR"
-    ),
-    cmaxes = c(100, 200, 300)
-  )
-
-  expect_true(
-    expo_pred$conc |> length() == expo_pred$conc |> unique() |> length()
-  )
-})