diff --git a/util/env_posix.cc b/util/env_posix.cc
index ffd06c4..87810a3 100644
--- a/util/env_posix.cc
+++ b/util/env_posix.cc
@@ -50,7 +50,7 @@ constexpr const int kDefaultMmapLimit = (sizeof(void*) >= 8) ? 1000 : 0;
 int g_mmap_limit = kDefaultMmapLimit;
 
 // Common flags defined for all posix open operations
-#if defined(HAVE_O_CLOEXEC)
+#if HAVE_O_CLOEXEC
 constexpr const int kOpenBaseFlags = O_CLOEXEC;
 #else
 constexpr const int kOpenBaseFlags = 0;