diff --git a/env/env_posix.cc b/env/env_posix.cc
index 387c0279397..09cacdd1cc9 100644
--- a/env/env_posix.cc
+++ b/env/env_posix.cc
@@ -33,6 +33,7 @@
 // Get nano time includes
 #if defined(OS_LINUX) || defined(OS_FREEBSD)
 #elif defined(__MACH__)
+#include <Availability.h>
 #include <mach/clock.h>
 #include <mach/mach.h>
 #else
@@ -839,7 +840,7 @@ class PosixEnv : public Env {
 
   uint64_t NowCPUNanos() override {
 #if defined(OS_LINUX) || defined(OS_FREEBSD) || defined(OS_AIX) || \
-    defined(__MACH__)
+    (defined(__MACH__) && defined(__MAC_10_12))
     struct timespec ts;
     clock_gettime(CLOCK_THREAD_CPUTIME_ID, &ts);
     return static_cast<uint64_t>(ts.tv_sec) * 1000000000 + ts.tv_nsec;