diff --git a/services/surfaceflinger/DispSync.cpp b/services/surfaceflinger/DispSync.cpp
index 829b53d..cdfbba3 100644
--- a/services/surfaceflinger/DispSync.cpp
+++ b/services/surfaceflinger/DispSync.cpp
@@ -40,6 +40,10 @@
 
 namespace android {
 
+DispSync::~DispSync() = default;
+
+namespace impl {
+
 // Setting this to true enables verbose tracing that can be used to debug
 // vsync event model or phase issues.
 static const bool kTraceDetailedInfo = false;
@@ -707,4 +711,6 @@
     result.appendFormat("current monotonic time: %" PRId64 "\n", now);
 }
 
+} // namespace impl
+
 } // namespace android