diff --git a/system_wrappers/source/event_timer_posix.cc b/system_wrappers/source/event_timer_posix.cc
index 2a6a580c64..e79aa9900a 100644
--- a/system_wrappers/source/event_timer_posix.cc
+++ b/system_wrappers/source/event_timer_posix.cc
@@ -10,6 +10,10 @@
 
 #include "system_wrappers/source/event_timer_posix.h"
 
+#if defined(WEBRTC_ANDROID)
+#include <android/api-level.h>
+#endif
+
 #include <errno.h>
 #include <pthread.h>
 #include <signal.h>
@@ -20,6 +24,17 @@
 
 #include "rtc_base/checks.h"
 
+#if defined(HAVE_PTHREAD_COND_TIMEDWAIT_MONOTONIC)
+// Chromium build is always defining this macro if __ANDROID_API__ < 20.
+#undef HAVE_PTHREAD_COND_TIMEDWAIT_MONOTONIC
+#endif
+
+#if defined(WEBRTC_ANDROID) && defined(__ANDROID_API__)
+#define HAVE_PTHREAD_COND_TIMEDWAIT_MONOTONIC (__ANDROID_API__ < 21)
+#else
+#define HAVE_PTHREAD_COND_TIMEDWAIT_MONOTONIC 0
+#endif
+
 namespace webrtc {
 
 // static
@@ -48,8 +63,7 @@ EventTimerPosix::EventTimerPosix()
 // all supported Android platforms support pthread_condattr_setclock.
 // TODO(sprang): Add support for monotonic clock on Apple platforms.
 #if !(defined(WEBRTC_MAC) || defined(WEBRTC_IOS)) && \
-    !(defined(WEBRTC_ANDROID) &&                     \
-      defined(HAVE_PTHREAD_COND_TIMEDWAIT_MONOTONIC))
+    !(defined(WEBRTC_ANDROID) && HAVE_PTHREAD_COND_TIMEDWAIT_MONOTONIC)
   pthread_condattr_setclock(&cond_attr, CLOCK_MONOTONIC);
 #endif
   pthread_cond_init(&cond_, &cond_attr);
@@ -96,7 +110,7 @@ EventTypeWrapper EventTimerPosix::Wait(unsigned long timeout_ms) {
         end_at.tv_nsec -= kNanosecondsPerSecond;
       }
       while (ret_val == 0 && !event_set_) {
-#if defined(WEBRTC_ANDROID) && defined(HAVE_PTHREAD_COND_TIMEDWAIT_MONOTONIC)
+#if defined(WEBRTC_ANDROID) && HAVE_PTHREAD_COND_TIMEDWAIT_MONOTONIC
         ret_val = pthread_cond_timedwait_monotonic_np(&cond_, &mutex_, &end_at);
 #else
         ret_val = pthread_cond_timedwait(&cond_, &mutex_, &end_at);
@@ -129,7 +143,7 @@ EventTypeWrapper EventTimerPosix::Wait(timespec* end_at, bool reset_event) {
   }
 
   while (ret_val == 0 && !event_set_) {
-#if defined(WEBRTC_ANDROID) && defined(HAVE_PTHREAD_COND_TIMEDWAIT_MONOTONIC)
+#if defined(WEBRTC_ANDROID) && HAVE_PTHREAD_COND_TIMEDWAIT_MONOTONIC
     ret_val = pthread_cond_timedwait_monotonic_np(&cond_, &mutex_, end_at);
 #else
     ret_val = pthread_cond_timedwait(&cond_, &mutex_, end_at);