diff --git a/services/surfaceflinger/SurfaceTracing.h b/services/surfaceflinger/SurfaceTracing.h
index 4be2ee9..4773307 100644
--- a/services/surfaceflinger/SurfaceTracing.h
+++ b/services/surfaceflinger/SurfaceTracing.h
@@ -41,7 +41,7 @@
  */
 class SurfaceTracing {
 public:
-    SurfaceTracing(SurfaceFlinger& flinger);
+    explicit SurfaceTracing(SurfaceFlinger& flinger);
     void enable();
     bool disable();
     status_t writeToFile();