diff --git a/DESCRIPTION b/DESCRIPTION
index 6ff8f7f..532d61f 100644
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -1,6 +1,6 @@
 Package: efun
 Title: Miscellaneous Functions by E
-Version: 0.3.4
+Version: 0.3.5
 Authors@R: 
     person(given = "Eduardo",
            family = "Alfonso-Sierra",
diff --git a/R/assert.R b/R/assert.R
index 5339728..a600efd 100644
--- a/R/assert.R
+++ b/R/assert.R
@@ -37,7 +37,8 @@ assert <- function(.data, ..., msg = "Assertion does not hold", na.rm = TRUE) {
     return(.data)
   } else {
     fail_msg <- purrr::imap(conds_eval, \(x, idx) {
-      n_fail <- sum(!x)
+      n_fail <- sum(!x, na.rm = na.rm)
+
       if (n_fail > 0) {
         paste0(
           "\t`", idx, "` is false ",
diff --git a/tests/testthat/test-assert.R b/tests/testthat/test-assert.R
index 1b97f57..77f3a21 100644
--- a/tests/testthat/test-assert.R
+++ b/tests/testthat/test-assert.R
@@ -17,6 +17,12 @@ test_that("assert() does not fail testing data with NAs", {
       dplyr::mutate(mpg = dplyr::na_if(mpg, 15)) |>
       assert(mpg > 10)
   )
+  expect_error(
+    object = mtcars |>
+      dplyr::mutate(mpg = dplyr::na_if(mpg, 15)) |>
+      assert(mpg > 10, !is.na(mpg)),
+    regexp = "Assertion does not hold"
+  )
 })
 
 test_that("assert() can handle multiple conditions", {