diff --git a/cmds/dumpsys/dumpsys.h b/cmds/dumpsys/dumpsys.h
index 84f3b02..c48a1e9 100644
--- a/cmds/dumpsys/dumpsys.h
+++ b/cmds/dumpsys/dumpsys.h
@@ -26,7 +26,7 @@
 
 class Dumpsys {
   public:
-    Dumpsys(android::IServiceManager* sm) : sm_(sm) {
+    explicit Dumpsys(android::IServiceManager* sm) : sm_(sm) {
     }
     /**
      * Main entry point into dumpsys.