diff --git a/util/env_test.cc b/util/env_test.cc
index 2584b4a3c..e5b6f0260 100644
--- a/util/env_test.cc
+++ b/util/env_test.cc
@@ -365,7 +365,7 @@ TEST(EnvPosixTest, PosixRandomRWFileTest) {
   unique_ptr<RandomRWFile> file;
   ASSERT_OK(env_->NewRandomRWFile(fname, &file, soptions));
   // If you run the unit test on tmpfs, then tmpfs might not
-  // support ftruncate. It is still better to trigger that
+  // support fallocate. It is still better to trigger that
   // code-path instead of eliminating it completely.
   file.get()->Allocate(0, 10*1024*1024);
   ASSERT_OK(file.get()->Write(100, Slice("Hello world")));