diff --git a/R/modules.R b/R/modules.R
index 7e39e44b60..76dea53d68 100644
--- a/R/modules.R
+++ b/R/modules.R
@@ -264,7 +264,7 @@ module <- function(label = "module",
   }
   checkmate::assert_list(transformers, types = "teal_transform_module")
   transformer_datanames <- unlist(lapply(transformers, attr, "datanames"))
-  combined_datanames <- if (identical(datanames, "all") || identical(transformer_datanames, "all")) {
+  combined_datanames <- if (identical(datanames, "all") || any(sapply(transformer_datanames, identical, "all"))) {
     "all"
   } else {
     union(datanames, transformer_datanames)
diff --git a/tests/testthat/test-modules.R b/tests/testthat/test-modules.R
index abd9c8f144..594e801d45 100644
--- a/tests/testthat/test-modules.R
+++ b/tests/testthat/test-modules.R
@@ -534,7 +534,7 @@ testthat::test_that("module datanames is appended by its transformers datanames"
   testthat::expect_identical(out$datanames, c("c", "a", "b"))
 })
 
-testthat::test_that("module datanames is set to 'all' if transformer $datanames is 'all'", {
+testthat::test_that("module datanames is set to 'all' if any transformer $datanames is 'all'", {
   transformer_w_datanames <- teal_transform_module(
     ui = function(id) NULL,
     server = function(id, data) {