diff --git a/tests/testthat/test-location-path.R b/tests/testthat/test-location-path.R
index a66e6e3e..a951dd6c 100644
--- a/tests/testthat/test-location-path.R
+++ b/tests/testthat/test-location-path.R
@@ -334,10 +334,11 @@ test_that("Can read metadata files with a trailing newline", {
   path <- file.path(root$path, ".outpack", "metadata", id)
 
   # Calling writeLines adds the trailing newline and mimicks the old orderly2
-  # behaviour.
+  # behaviour. The size will be one or two bytes bigger than the actual data,
+  # depending on whether the newline is `\n` or `\r\n`.
   old_size <- file.info(path)$size
   writeLines(read_string(path), path)
-  expect_equal(file.info(path)$size, old_size + 1)
+  expect_gte(file.info(path)$size, old_size + 1)
 
   # Reading the metadata from a location at that path correctly strips the
   # newline and hashes correctly.
diff --git a/tests/testthat/test-util.R b/tests/testthat/test-util.R
index e2fb228d..bac860c5 100644
--- a/tests/testthat/test-util.R
+++ b/tests/testthat/test-util.R
@@ -328,7 +328,8 @@ test_that("read_string strips newlines", {
   writeLines(c("", "12345678"), path)
 
   # 8 characters, a leading newline and a trailing one
-  expect_equal(file.info(path)$size, 10)
+  # Each newline may be one of two bytes each, depending on the platform.
+  expect_gte(file.info(path)$size, 10)
 
   result <- expect_silent(read_string(path))
   expect_equal(result, "12345678")