diff --git a/NAMESPACE b/NAMESPACE
index 84cd66a4e..84d39b78c 100644
--- a/NAMESPACE
+++ b/NAMESPACE
@@ -25,8 +25,8 @@ S3method(as.data.frame,performance_score)
 S3method(as.data.frame,r2_bayes)
 S3method(as.data.frame,r2_loo)
 S3method(as.data.frame,r2_nakagawa)
+S3method(as.double,check_outliers)
 S3method(as.double,performance_roc)
-S3method(as.numeric,check_outliers)
 S3method(check_autocorrelation,default)
 S3method(check_collinearity,BFBayesFactor)
 S3method(check_collinearity,MixMod)
diff --git a/R/check_outliers.R b/R/check_outliers.R
index 0e68d1b18..8770e12b3 100644
--- a/R/check_outliers.R
+++ b/R/check_outliers.R
@@ -599,7 +599,7 @@ as.data.frame.check_outliers <- function(x, ...) {
 }
 
 #' @export
-as.numeric.check_outliers <- function(x, ...) {
+as.double.check_outliers <- function(x, ...) {
   attributes(x)$data$Outlier
 }
 
diff --git a/tests/testthat/test-check_outliers.R b/tests/testthat/test-check_outliers.R
index f037950c8..db31e000d 100644
--- a/tests/testthat/test-check_outliers.R
+++ b/tests/testthat/test-check_outliers.R
@@ -406,3 +406,10 @@ test_that("check_outliers with DHARMa", {
     )
   )
 })
+
+
+test_that("check_outliers with DHARMa", {
+  data(mtcars)
+  out <- check_outliers(mtcars$mpg, method = "zscore", threshold = 2)
+  expect_equal(which(as.numeric(out) == 1), c(18, 20))
+})