diff --git a/util/env_posix.cc b/util/env_posix.cc
index e81c59dcc..2be524e95 100644
--- a/util/env_posix.cc
+++ b/util/env_posix.cc
@@ -1297,7 +1297,7 @@ class PosixEnv : public Env {
   }
 
   bool SupportsFastAllocate(const std::string& path) {
-#ifdef OS_LINUX
+#ifdef ROCKSDB_FALLOCATE_PRESENT
     struct statfs s;
     if (statfs(path.c_str(), &s)){
       return false;