diff --git a/src/util.cpp b/src/util.cpp
index 82d705ea8..2e56e88da 100644
--- a/src/util.cpp
+++ b/src/util.cpp
@@ -699,7 +699,7 @@ void FileCommit(FILE *fileout)
 #else
     #if defined(__linux__) || defined(__NetBSD__)
     fdatasync(fileno(fileout));
-    #elif defined(__APPLE__) && defined(F_FULLFSYNC)
+    #elif defined(MAC_OSX) && defined(F_FULLFSYNC)
     fcntl(fileno(fileout), F_FULLFSYNC, 0);
     #else
     fsync(fileno(fileout));