diff --git a/tests/WriteReflectionsTest.cpp b/tests/WriteReflectionsTest.cpp
index cbbca2206..21c928098 100644
--- a/tests/WriteReflectionsTest.cpp
+++ b/tests/WriteReflectionsTest.cpp
@@ -187,8 +187,12 @@ TEST_CASE("Unmerged MTZ: built on several workers, the same rows as on one", "[w
                                                    OutputProvenance{}, 8);
         REQUIRE(serial.columns[0].values.size() > 100000);
         REQUIRE(parallel.columns.size() == serial.columns.size());
-        for (size_t c = 0; c < serial.columns.size(); c++)
-            CHECK(parallel.columns[c].values == serial.columns[c].values);
+        // Bitwise, so the NaN of a missing value compares equal to itself.
+        for (size_t c = 0; c < serial.columns.size(); c++) {
+            REQUIRE(parallel.columns[c].values.size() == serial.columns[c].values.size());
+            CHECK(std::memcmp(parallel.columns[c].values.data(), serial.columns[c].values.data(),
+                              serial.columns[c].values.size() * sizeof(float)) == 0);
+        }
         REQUIRE(parallel.batches.size() == serial.batches.size());
         CHECK(parallel.batches.front().number == serial.batches.front().number);
         CHECK(parallel.batches.back().number == serial.batches.back().number);