diff --git a/src/unix/thread.c b/src/unix/thread.c
index c7ff3fa4..f8846225 100644
--- a/src/unix/thread.c
+++ b/src/unix/thread.c
@@ -618,7 +618,16 @@ int uv_cond_timedwait(uv_cond_t* cond, uv_mutex_t* mutex, uint64_t timeout) {
   timeout += uv__hrtime(UV_CLOCK_PRECISE);
   ts.tv_sec = timeout / NANOSEC;
   ts.tv_nsec = timeout % NANOSEC;
+#if defined(__ANDROID_API__) && __ANDROID_API__ < 21
+
+  /*
+   * The bionic pthread implementation doesn't support CLOCK_MONOTONIC,
+   * but has this alternative function instead.
+   */
+  r = pthread_cond_timedwait_monotonic_np(cond, mutex, &ts);
+#else
   r = pthread_cond_timedwait(cond, mutex, &ts);
+#endif /* __ANDROID_API__ */
 #endif