diff --git a/R/pareto_smooth.R b/R/pareto_smooth.R
index 52ec6bb..4593ce9 100644
--- a/R/pareto_smooth.R
+++ b/R/pareto_smooth.R
@@ -259,8 +259,8 @@ pareto_smooth.default <- function(x,
                                   are_log_weights = FALSE,
                                   ...) {
 
-  checkmate::expect_numeric(ndraws_tail, null.ok = TRUE)
-  checkmate::expect_numeric(r_eff, null.ok = TRUE)
+  checkmate::assert_numeric(ndraws_tail, null.ok = TRUE)
+  checkmate::assert_numeric(r_eff, null.ok = TRUE)
   extra_diags <- as_one_logical(extra_diags)
   return_k <- as_one_logical(return_k)
   verbose <- as_one_logical(verbose)
diff --git a/R/weight_draws.R b/R/weight_draws.R
index 3449482..fa8bfd8 100644
--- a/R/weight_draws.R
+++ b/R/weight_draws.R
@@ -179,8 +179,8 @@ weights.draws <- function(object, log = FALSE, normalize = TRUE, ...) {
 
 # validate weights and return log weights
 validate_weights <- function(weights, draws, log = FALSE) {
-  checkmate::expect_numeric(weights)
-  checkmate::expect_flag(log)
+  checkmate::assert_numeric(weights)
+  checkmate::assert_flag(log)
   if (length(weights) != ndraws(draws)) {
     stop_no_call("Number of weights must match the number of draws.")
   }