diff --git a/src/mesh/wifi/WiFiServerAPI.h b/src/mesh/wifi/WiFiServerAPI.h
index e27e5183d..84a23be06 100644
--- a/src/mesh/wifi/WiFiServerAPI.h
+++ b/src/mesh/wifi/WiFiServerAPI.h
@@ -44,7 +44,7 @@ class WiFiServerPort : public WiFiServer, private concurrency::OSThread
     WiFiServerAPI *openAPI = NULL;
 
   public:
-    WiFiServerPort(int port);
+    explicit WiFiServerPort(int port);
 
     void init();