diff --git a/src/uvc/uvc-wmf.cc b/src/uvc/uvc-wmf.cc
index 8200e7d..0c2caed 100644
--- a/src/uvc/uvc-wmf.cc
+++ b/src/uvc/uvc-wmf.cc
@@ -21,7 +21,7 @@ struct device {
 
   int vid, pid;
 
-  device(std::shared_ptr<context> parent) : parent(parent) {
+  explicit device(std::shared_ptr<context> parent) : parent(parent) {
     VLOG(2) << __func__;
   }