--- stats.c
+++ stats.c
@@ -142,6 +142,10 @@
      pthread_mutex_unlock(&s_stats.mutex);
 }
 
+#ifndef CLK_TCK
+#define CLK_TCK CLOCKS_PER_SEC
+#endif
+
 /*
  * Called at the end of the main thread, when no other threads are
  * running, to print the final statistics.