diff --git a/src/lib/platform/MSWindowsWatchdog.h b/src/lib/platform/MSWindowsWatchdog.h
index c6ec0fba24..9f161b187b 100644
--- a/src/lib/platform/MSWindowsWatchdog.h
+++ b/src/lib/platform/MSWindowsWatchdog.h
@@ -33,7 +33,7 @@ class MSWindowsWatchdog
   };
 
 public:
-  MSWindowsWatchdog(bool foreground);
+  explicit MSWindowsWatchdog(bool foreground);
   ~MSWindowsWatchdog() = default;
 
   void startAsync();