diff --git a/logd/LogReader.h b/logd/LogReader.h
index 98674b8..fdcedf1 100644
--- a/logd/LogReader.h
+++ b/logd/LogReader.h
@@ -27,7 +27,7 @@
     LogBuffer &mLogbuf;
 
 public:
-    LogReader(LogBuffer *logbuf);
+    explicit LogReader(LogBuffer *logbuf);
     void notifyNewLog();
 
     LogBuffer &logbuf(void) const { return mLogbuf; }