diff --git a/runtime/trace.cc b/runtime/trace.cc
index 29a3b09..5066e03 100644
--- a/runtime/trace.cc
+++ b/runtime/trace.cc
@@ -150,7 +150,7 @@
 }
 
 void Trace::SetDefaultClockSource(TraceClockSource clock_source) {
-#if defined(HAVE_POSIX_CLOCKS)
+#if defined(__linux__)
   default_clock_source_ = clock_source;
 #else
   if (clock_source != kTraceClockSourceWall) {