diff --git a/libc/malloc_debug/tests/malloc_debug_unit_tests.cpp b/libc/malloc_debug/tests/malloc_debug_unit_tests.cpp
index b24f4ad..79f946f 100644
--- a/libc/malloc_debug/tests/malloc_debug_unit_tests.cpp
+++ b/libc/malloc_debug/tests/malloc_debug_unit_tests.cpp
@@ -2581,7 +2581,7 @@
   // Mark only some pages in use.
   uint8_t* data = reinterpret_cast<uint8_t*>(ptr);
   // Make sure the memory is not in use.
-  ASSERT_EQ(0, madvise(ptr, pagesize * 8, MADV_PAGEOUT));
+  ASSERT_EQ(0, madvise(ptr, pagesize * 8, MADV_DONTNEED));
   // Dirty three non-consecutive pages.
   data[0] = 1;
   data[pagesize * 2] = 1;